Flowmaster performance
Thread Starter
Advanced
Joined: Mar 2004
Posts: 75
Likes: 0
From: West Des Moines IA
Flowmaster performance
Is there a noticeable performace increase when bolting on Flowmasters with otherwise stock exhaust on an L98?? I have already done the other basic mods and noticed very little differance in performance.
Racer
Joined: Jun 2004
Posts: 440
Likes: 1
From: Grapevine Texas
Diesel,
I would stay away from the Flowmasters unless you really like your chassis being resonated to death....if you have cats in the car it will not be that bad though. I have a dual 3" in my stroker and the Flows are really loud, but their resonance is what will get irritating...
I would stay away from the Flowmasters unless you really like your chassis being resonated to death....if you have cats in the car it will not be that bad though. I have a dual 3" in my stroker and the Flows are really loud, but their resonance is what will get irritating...
Advanced
Joined: Aug 2004
Posts: 98
Likes: 0
From: Miami FL
I have the 50 series on mine.. gutted cat.. sounds great.. I dont have any resonance.. then again I dont have a 400hp engine either.. as far as hp gains.. nothing that I can notice.. need a dyno or track to tell you that.. feels faster or maybe its mind games because of how much louder it is now.. 
Racer
Joined: Oct 2001
Posts: 274
Likes: 0
From: Bradenton Fl
I ran .271 tenths faster in the 1/4 mile with a flowmaster cat back and a gutted cat. I have no problem with noise. I think when you install the mufflers make sure the tips extend from under the car should help with any interior noise
Instructor
Joined: Jan 2005
Posts: 141
Likes: 0
From: Tucson AZ
Flowmaster 40's here
The car may not be any faster with the Flowmasters, but it sure sounds like it is.
Actually, I do think it breathes a bit easier. How much that translates to HP at the rear wheels I am not sure. It's not hurting anything and that IS for sure.
Actually, I do think it breathes a bit easier. How much that translates to HP at the rear wheels I am not sure. It's not hurting anything and that IS for sure.
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Racer
Joined: Oct 2001
Posts: 311
Likes: 2
From: Roseburg OR
go Force II
I put the system for a LT1 on my 90 L98, got rid of the cats, still have the stock exhaust manifolds. Sounds great and it got rid of resonance i had in 6th gear, now road noise is louder than the exhaust at cruise. I used to wear earplugs with the stock exhaust for any trip out of town.
It seems that just putting flowmasters on a stock exhaust further aggravates the resonance to the point of being unbearable and has given flow masters a bad name. I can send you a sound clip hawmanai*yahoo.com.
It seems that just putting flowmasters on a stock exhaust further aggravates the resonance to the point of being unbearable and has given flow masters a bad name. I can send you a sound clip hawmanai*yahoo.com.
Advanced
Joined: Feb 2005
Posts: 77
Likes: 0
From: N. Tonawanda NY
Flowmaster Force II
I put a Flowmaster Force II Muffler system on my 90 Vette and they sound great. There is a little resonance when your cruising at highway speeds and the motor is under a slight load like going up a small hill, otherwise comparatively quiet. Put your foot into it and they really growl.
Melting Slicks
Joined: May 2001
Posts: 3,270
Likes: 26
From: Winchester VA
Cruise-In V Veteran
Is there a [edit] performance increase
noticeable
For a noticeable increase in acceleration, gears are usually the best bet (major engine work excluded). They will wake your car right up, just don't over do it.
