Flowmaster or Dynomax
Le Mans Master
Joined: Aug 2000
Posts: 5,294
Likes: 2
From: Suffolk, Long Island NY
IIRC, dynomax is only 2.25" at the muffler. Not that there is a big gain by changing the mufflers on these cars, but I wouldn't recommend them if you're looking for any sort of gain. And flowmasters aren't known to be a good flowing muffler.
Race Director
Joined: Mar 2001
Posts: 10,030
Likes: 10
From: Prescott AZ
St. Jude Donor '04
Originally Posted by Bud2000
Has anyone tried Flowmasters or Dynomax Super Turbos or Dynomax Ultraflows on a C5? Resonance/loudness comparisons. How about ease of installation.
Melting Slicks
Joined: Dec 2003
Posts: 2,857
Likes: 2
From: pawleys island sc
Originally Posted by Face
IIRC, dynomax is only 2.25" at the muffler. Not that there is a big gain by changing the mufflers on these cars, but I wouldn't recommend them if you're looking for any sort of gain. And flowmasters aren't known to be a good flowing muffler.
Race Director
Joined: Jul 2005
Posts: 11,308
Likes: 1
From: The Beautiful Greater Bay Area California
Loved the Flowmasters on my C4's back in the early nineties. Thankfully, newer technology, and, a wider range of C5 specific competitive exhaust products have long since been developed. Look into the Corsa's, Magnaflow's, Borla's, and, for an even more aggressive exhaust note, the B&B's, etc. Good luck to you.
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
I have had both Flowmasters and Dynomax on my C5 and neither was much louder than stock mufflers.
Also, the Dynomax mufflers are Ultra Flow not Super Turbo. Very quiet in comparison. They don't make a Super Turbo for the C5.
You'd have to have 2 F-body Super Turbos modified (weld the end with the single opening shut). Also, I was not impressed with the tips that were welded on either muffler. Small, round openings (I didn't want the Flowmasters with the double D tips) thin wall chrome plated.
cc
Also, the Dynomax mufflers are Ultra Flow not Super Turbo. Very quiet in comparison. They don't make a Super Turbo for the C5.
You'd have to have 2 F-body Super Turbos modified (weld the end with the single opening shut). Also, I was not impressed with the tips that were welded on either muffler. Small, round openings (I didn't want the Flowmasters with the double D tips) thin wall chrome plated.
cc
Race Director
Joined: Mar 2001
Posts: 11,405
Likes: 26
From: Whippany NJ
CI 6-7-8-9 Veteran
St. Jude Donor '08-'09
NCM Sinkhole Donor
Originally Posted by Wicked C5
Neither brand is good a C5. It's not a Mustang. I've heard both in person on a C5
waste of money for a c5. GHL magnum plus series are awesome! sounds perfect, not too loud, not too quiet, and best of all zero resonance! 
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Advanced
Joined: Oct 2005
Posts: 60
Likes: 0
From: Goode VA
I've got the Flowmasters on my car, though they were there when I purchased the car. I am switching to B&B Bullets b/c I'm not a fan of the Flowmaster sound, plus I hate the tips that came on the mufflers (the Double-Ds). They are louder than stock, though definitely not too loud. They also have a resonance around 2500 RPM but thats easily avoidable if it really bothers you. The sound really good at WOT with a nice, muscular gurgle at idle (like all Flowmasters). I can't speak for performance, though I will be on the dyno next weekend for a baseline. Some people on here really LOVE Flowmasters. It is of very nice quality and is assembled like a stock system. It also came with the over-axle tubes.
I wouldn't call them a waste of money at all if thats the sound you are looking for. If its all out HP gains you are looking for, I'd look into something else.
Mine will be coming up for sale in a couple of weeks when I get my B&Bs, PM me if interested.
I wouldn't call them a waste of money at all if thats the sound you are looking for. If its all out HP gains you are looking for, I'd look into something else.
Mine will be coming up for sale in a couple of weeks when I get my B&Bs, PM me if interested.
Le Mans Master
Joined: Jun 2004
Posts: 6,269
Likes: 50
From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
Originally Posted by CCrane00
I have had both Flowmasters and Dynomax on my C5 and neither was much louder than stock mufflers.
Also, the Dynomax mufflers are Ultra Flow not Super Turbo. Very quiet in comparison.
cc
Also, the Dynomax mufflers are Ultra Flow not Super Turbo. Very quiet in comparison.
cc
I had the Dynomax and had to do the A&A Mod to get any sound. Put on Borlas and love 'em.
Racer
Joined: Dec 2005
Posts: 431
Likes: 0
From: North Las Vegas Nevada
I have always heard that Flowmasters were great mufflers, regardless of what vehicle they were on. All the racers use them, which should tell you something. I have them on my C5 and they sound good. A little rumble and a little loudness, but not much. And no resonance at all. I honestly would love a "loud as hell " system, but you have to live with that sound all the time, and that could get rough!
Le Mans Master
Joined: Aug 2000
Posts: 5,294
Likes: 2
From: Suffolk, Long Island NY
Originally Posted by allmee
I have always heard that Flowmasters were great mufflers, regardless of what vehicle they were on.
Seriously though, if you're talking about the pros, the mufflers they use and the flowmasters that fit our application, are two totally designs.
Thread Starter
Cruising
Joined: Jan 2006
Posts: 10
Likes: 0
Flowmaster or Dynomax
Thanks for all the info. Deciding on a muffler setup is turning into a real project. I would really like something real loud but also need a setup my wife will tolerate on long trips. Maybe cutouts are the answer.
Drifting
Joined: Apr 2005
Posts: 1,899
Likes: 1
From: Oceanside CA
I've had Flowmasters on for about a year and although they aren't the loudest system out there by any means I like the sound and there isn't any resonance. I have quad tips which are nicely done, not the double D's. I wouldn't get too caught up in the hype over brand name systems though. Go to www.ls1sounds.com and listen to various systems then make up your own mind.
Instructor
Joined: Jun 2003
Posts: 105
Likes: 0
From: Los Angeles California
I have the Flowmaster 80s with the round tips, over the axle 2 5/8" tubes hooked up to a set of LG long tubes with the hi flow cats and x pipe. Combined with AFR's, mild cam, Katech tb, Blackwing and Denso IT 20's the car hauls *** and sounds bad ***. Loud, ah yes, resonance a little, but nothing compared to my buddy's stingers onm a similar set up which are a cop magnet.
