Flowmaster force II on Lt1 cars - CorvetteForum - Chevrolet Corvette Forum Discussion


C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Flowmaster force II on Lt1 cars

Reply
 
 
 
Thread Tools Search this Thread
Old 02-14-2018, 06:52 AM   #1
barchetta1
CF Senior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 181
Thanked 1 Time in 1 Post
Default Flowmaster force II on Lt1 cars

So... anyone running the complete flowmaster force II? Ive read on here just installing flowmaster mufflers alone will lead to droning so Im only considering the whole deal.. besides its reasonably priced.


Can anyone give me comments? Specifically im interested in...

Tone at Idle

Volume at idle

cabin sound while just cruising on local streets with top up/roof on..

cabin sound while just cruising on local streets with roof off..

Does the exhaust note sound tuned or does it sound like an untuned open v8 exhaust?

It seems like it is not as low sounding as a magnaflow.. correct observation? Im just listening to youtube.

Glad you stuck with proper rectangular tips?

After much thought, Ive decided at this time to leave stock manifold and cats in place. Ive heard no real good about removing cats because low end power is lost on the lt1.. so please indicate if you have left all of this alone.
barchetta1 is offline   Reply With Quote
Old 02-14-2018, 12:34 PM   #2
FASTAZU
CF Senior Member
 
FASTAZU's Avatar
 
Member Since: Feb 2002
Location: Compound in the Grove, Ga.
Posts: 9,628
Thanked 212 Times in 195 Posts
C4 of Month Finalist 2015
St. Jude Donor '16
Default

Good luck

Last edited by FASTAZU; 02-14-2018 at 11:05 PM.
FASTAZU is offline   Reply With Quote
Old 02-14-2018, 02:52 PM   #3
pacoW
CF Member
 
pacoW's Avatar
 
Member Since: Jul 2017
Location: PA
Posts: 59
Thanked 4 Times in 4 Posts
Default

the '96 I bought recently came with flowcrappers. Don't know if it's the whole system but the drone is real bad. Would have removed them already but they welded the mufflers on. I may try some dynamat on the rear compartment first before I have to spend money on a new exhaust.
pacoW is offline   Reply With Quote
Old 02-14-2018, 07:02 PM   #4
FASTAZU
CF Senior Member
 
FASTAZU's Avatar
 
Member Since: Feb 2002
Location: Compound in the Grove, Ga.
Posts: 9,628
Thanked 212 Times in 195 Posts
C4 of Month Finalist 2015
St. Jude Donor '16
Default

Quote:
Originally Posted by pacoW View Post
the '96 I bought recently came with flowcrappers. Don't know if it's the whole system but the drone is real bad. Would have removed them already but they welded the mufflers on. I may try some dynamat on the rear compartment first before I have to spend money on a new exhaust.
https://www.corvetteforum.com/forums...-mufflers.html

https://www.corvetteforum.com/forums...stem-free.html
FASTAZU is offline   Reply With Quote
Old 02-14-2018, 07:34 PM   #5
barchetta1
CF Senior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 181
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by pacoW View Post
the '96 I bought recently came with flowcrappers. Don't know if it's the whole system but the drone is real bad. Would have removed them already but they welded the mufflers on. I may try some dynamat on the rear compartment first before I have to spend money on a new exhaust.
Sorry I replied to wrong message./. Im looking for feedback on the entire system not just a set of random flowmasters connected to god knows what..

Im looking for feedback specifically on the force II..

Last edited by barchetta1; 02-14-2018 at 07:39 PM.
barchetta1 is offline   Reply With Quote
Old 02-14-2018, 07:35 PM   #6
barchetta1
CF Senior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 181
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by pacoW View Post
the '96 I bought recently came with flowcrappers. Don't know if it's the whole system but the drone is real bad. Would have removed them already but they welded the mufflers on. I may try some dynamat on the rear compartment first before I have to spend money on a new exhaust.

If you dont have a resonance center pipe then it is not the entire system.
barchetta1 is offline   Reply With Quote
Old 02-14-2018, 10:03 PM   #7
STL94LT1
CF Senior Member
 
STL94LT1's Avatar
 
Member Since: Jan 2002
Location: O'Fallon Missouri
Posts: 12,120
Thanked 29 Times in 26 Posts
Default

I've ran the Flowmaster Force II cat-back on my 94 for over 20 years. At first I ran it with the factory manifolds and cats. Then with Hooker Shorties and stock cats. Finally with EM Headers and bullet cats.

My car is a M6 and from what I remember a small amount of resonance with the Force II and factory exhaust setup at cruise. If you have an A4 may get drone at highway speeds. Eventually I went with the EM setup and 4.10 gears, no drone.

IMHO, the best sounding C4 LT1 cat-back. Loud at WOT, but not too loud. Powerful sound at cruise, and just a little drone.
STL94LT1 is offline   Reply With Quote
Old 02-15-2018, 12:58 PM   #8
barchetta1
CF Senior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 181
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by STL94LT1 View Post
I've ran the Flowmaster Force II cat-back on my 94 for over 20 years. At first I ran it with the factory manifolds and cats. Then with Hooker Shorties and stock cats. Finally with EM Headers and bullet cats.

My car is a M6 and from what I remember a small amount of resonance with the Force II and factory exhaust setup at cruise. If you have an A4 may get drone at highway speeds. Eventually I went with the EM setup and 4.10 gears, no drone.

IMHO, the best sounding C4 LT1 cat-back. Loud at WOT, but not too loud. Powerful sound at cruise, and just a little drone.
Do you remember what your idle was like with factory manifolds and cats? You sure have been thru trials and tribulations! this is my first mod and Im planning long term to go with lt headers and a cam.. so trying to buy something that I wont be replacing. I also want to go with a 3.59 rear gear. 4.10 might be a bit much but maybe not too.
barchetta1 is offline   Reply With Quote
Old 02-15-2018, 03:03 PM   #9
FASTAZU
CF Senior Member
 
FASTAZU's Avatar
 
Member Since: Feb 2002
Location: Compound in the Grove, Ga.
Posts: 9,628
Thanked 212 Times in 195 Posts
C4 of Month Finalist 2015
St. Jude Donor '16
Default

Have you tried u-tube for any sound clips or reviews? I changed to Corsa and love them no drone at any RPM and very loud at WOT.
FASTAZU is offline   Reply With Quote
Old 02-15-2018, 08:08 PM   #10
STL94LT1
CF Senior Member
 
STL94LT1's Avatar
 
Member Since: Jan 2002
Location: O'Fallon Missouri
Posts: 12,120
Thanked 29 Times in 26 Posts
Default

Mild powerful sound at idle.
STL94LT1 is offline   Reply With Quote
Old 02-16-2018, 12:41 PM   #11
1984Z51auto
CF Senior Member
 
1984Z51auto's Avatar
 
Member Since: Jan 2003
Location: Denver Colorado
Posts: 555
Thanked 15 Times in 15 Posts
Default

Quote:
Originally Posted by FASTAZU View Post
Have you tried u-tube for any sound clips or reviews? I changed to Corsa and love them no drone at any RPM and very loud at WOT.
I have the Corsa system on my '96 LT4 and it is very good, no drone period. I think there may be a difference in drone levels between the coupe and the roadster (more volume to drone in the coupe). Mine is a roadster with the hardtop.
1984Z51auto is offline   Reply With Quote
Old 02-16-2018, 12:53 PM   #12
barchetta1
CF Senior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 181
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by FASTAZU View Post
Have you tried u-tube for any sound clips or reviews? I changed to Corsa and love them no drone at any RPM and very loud at WOT.

I have with earbuds. Personally have not been drawn to the "corsa" sound but in person is likely different.
barchetta1 is offline   Reply With Quote
Old 02-16-2018, 01:00 PM   #13
barchetta1
CF Senior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 181
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by STL94LT1 View Post
Mild powerful sound at idle.

Thanks.. I may go with the force 2.. It seems to have a very distinct rev sound.

I think without a cam and maybe even long tube headers I wont be satisfied in the end though.

The last thing I want is a burbling pickup truck sound which is what I hear on most cars on youtube where the resonator was removed and whatever deal of the week on mufflers were installed.

Sounds very "untuned" to me if that makes any sense.
barchetta1 is offline   Reply With Quote
Old 02-16-2018, 02:56 PM   #14
mtwoolford
CF Senior Member
 
Member Since: Jan 2009
Location: folsom california
Posts: 2,988
Thanked 89 Times in 86 Posts
Default

Quote:
Originally Posted by 1984Z51auto View Post
I have the Corsa system on my '96 LT4 and it is very good, no drone period. I think there may be a difference in drone levels between the coupe and the roadster (more volume to drone in the coupe). Mine is a roadster with the hardtop.
my 96 LT4 came with the original exhaust replaced with "short", 2 chamber Flowmasters, and no resonator and it was the worst exhaust system ever; now the complete Flowmaster setup, which I believe has a resonator and the larger three chamber mufflers may be better; don't know. The Corsa was pricey but it works exactly as "advertised" as in it Corsa was the only manufacturer to include the word "quiet" in it's ad.
mtwoolford is offline   Reply With Quote
Old 02-16-2018, 07:54 PM   #15
STL94LT1
CF Senior Member
 
STL94LT1's Avatar
 
Member Since: Jan 2002
Location: O'Fallon Missouri
Posts: 12,120
Thanked 29 Times in 26 Posts
Default

Quote:
Originally Posted by barchetta1 View Post
The last thing I want is a burbling pickup truck sound which is what I hear on most cars on youtube where the resonator was removed and whatever deal of the week on mufflers were installed.

Sounds very "untuned" to me if that makes any sense.
You won't get this with the Force II system.
STL94LT1 is offline   Reply With Quote
Old 02-16-2018, 08:21 PM   #16
barchetta1
CF Senior Member
Thread Starter
 
Member Since: Nov 2017
Posts: 181
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by STL94LT1 View Post
You won't get this with the Force II system.
ok.. thanks.. I dont think Id get it with any cat back system really.. I do wonder about going on the cheap with the same 60 series mufflers and my stock resonator. I think essentially the resonator is located in a position to handle drone. But I could be wrong.

EDIT: anyone know what it looks like inside a stock Lt1 resonator?

Disregard.. I guess this is it.. cut down the middle so the two halves FOLD together.. looks really restrictive to me and looks like it would really "mix up" the pulses.. but again, what do I know? CERTAINLY it creates back pressure due to the drastic reduction in tube size.. but this is sometimes a very GOOD thing.
Attached Images
 

Last edited by barchetta1; 02-16-2018 at 08:35 PM.
barchetta1 is offline   Reply With Quote
Old 02-17-2018, 06:45 PM   #17
dolbnyc
CF Senior Member
 
Member Since: Jun 2009
Posts: 100
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I have it

Inside the car it is louder but outside the car its barely louder than stock. Not sure what these are going for now but I got my car with it already installed at about 60K miles, not sure how long it was on there before that but I have 145K now and its still in great shape. At the time the exhaust was only $399. I plan on getting a different system when I do the motor over.
I would try something different like corsa or B&B Fusion with the controller for quiet mode. Someone posted that earlier.

Last edited by dolbnyc; 02-17-2018 at 06:48 PM.
dolbnyc is offline   Reply With Quote
Old Yesterday, 01:35 PM   #18
Skippy
CF Senior Member
 
Skippy's Avatar
 
Member Since: Feb 2001
Location: Illinois
Posts: 205
Thanks: 0
Thanked 1 Time in 1 Post
Default

I have the Force II on my Grand Sport. It's been on the car for a few years now. I really, really like the system. My car doesn't have any mods other than the exhaust. The sound is pretty quiet cruising down the highway, but wakes up considerably over stock exhaust when running through the gears. Very good combination of sound characteristics, in my opinion. The sound is not like you hear on two-chamber Flowmaster mufflers which impart kind of an "old truck driving down the road" sound if you know what I mean. Here is a quick video, sorry, it's all I have:


My exhaust was stock when I bought the car in 2003. After a few years, I wanted something with a little more sound.

I went with Magnaflow stainless mufflers (part number 15623) welded to the stock exhaust, and the drone was horrible on long road trips. Coming back from Corvettes at Carlyle to Illinois back in 2006 (over 10 hour trip) convinced me to make a change. My ears were ringing for an entire day after that trip!

I recommend the Force II. Good luck!
Skippy is offline   Reply With Quote
Old Yesterday, 10:02 PM   #19
9T3VETTE
CF Senior Member
 
9T3VETTE's Avatar
 
Member Since: May 2007
Location: Motor City
Posts: 1,021
Thanked 57 Times in 42 Posts
Default

Quote:
Originally Posted by STL94LT1 View Post
I've ran the Flowmaster Force II cat-back on my 94 for over 20 years. At first I ran it with the factory manifolds and cats. Then with Hooker Shorties and stock cats. Finally with EM Headers and bullet cats.

My car is a M6 and from what I remember a small amount of resonance with the Force II and factory exhaust setup at cruise. If you have an A4 may get drone at highway speeds. Eventually I went with the EM setup and 4.10 gears, no drone.

IMHO, the best sounding C4 LT1 cat-back. Loud at WOT, but not too loud. Powerful sound at cruise, and just a little drone.
Have sound clips by any chance? Iím interegued by the system after your comments.

Not much info/videos floating around with the force 2 and long tubes. Thanks.
9T3VETTE is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Flowmaster force II on Lt1 cars
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    C5 muffler after Longtube headers, x pipe and hi flow cats. Bob426 C5 General 2 01-25-2018 12:22 PM
    Flowmaster Cat-Back System 409S - DOR - Force II (part #817680) Flowmaster Exhaust C4 Vendor for Sale 0 02-09-2017 06:23 PM
    Would you buy the Corsa Sport exhaust? skyrex99 C6 Corvette General Discussion 99 12-20-2016 07:49 PM
    First impressions of the Force II Axle-back system (part #817512) Gary7 C6 Corvette General Discussion 7 10-10-2016 11:23 PM
    FlowMaster Force2 Exhaust - $200 neverstop Northern California 0 03-22-2016 03:09 PM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump

    Sponsored Ads
    Vendor Directory

    All times are GMT -4. The time now is 05:44 PM.


    We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
     
    • Ask a Question
      Get answers from community experts
    Question Title:
    Description:
    Your question will be posted in: