[Pics] My custom Flowmaster Header-Back
Thread Starter
Le Mans Master
Joined: Mar 2001
Posts: 9,464
Likes: 1
From: Modesto CA
[Pics] My custom Flowmaster Header-Back
Parts List:
Heddman Header Xtensions
Part #18804 = $22
Flowmaster Y-Collector
Part #Y250300a = $40 (two of these)
Dynomax Race Bullet
Part #24222 = $36
Summit 16-guage Mandrel U-Bend
Part #622003 = $17 (two of these)
Parts Total = $172
This of course would be more money, if you wanted to substitue a Catalytic Converter in place of the race bullet. Also, you'll have to add in a set of tips, or use your stock tips.
This system is entirely mandrel bent, it took the guys at the muffler shop 2 hours to get it all on and put together (Charge $50 an hour). I specifically told them I did NOT want them to bend any pipes, but instead, just cut and weld my mandrel bends, to make it work. (I had already drawn out on paper what I wanted them to do.)
IMHO, this is THE BEST exhaust system for an L98, bar NONE. Many people might argue that this exhaust would be too loud for their taste, but for those people, I invite them to drive my car. Only under 100% WOT, is it noticeable. During daily driving, even a guy who drives another vette, asked me if my exhaust was stock or what?
Also, another IMHO, for $300 (YMMV) this system just happens to be the cheapest Header-Back exhaust for our 84-91's.
Last edited by TIMSPEED; Mar 12, 2005 at 09:17 PM.
Instructor
Joined: Mar 2004
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From: Minneapolis MN
Team Owner
Joined: Dec 2000
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From: Phila., PA burbs
Looks good Tim. Did you do any before and after testing at the track? Just curious to hear the gains. We all know how how constrictive the stock L98 systems are, so I'm sure the gain was pretty substantial.
Race Director
Joined: May 2003
Posts: 10,749
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Originally Posted by TIMSPEED
Well, with the stock system with the mufflers cut off, I went 13.59, so, when I run the 12.80's, I'll let you know 
12.8's.....going to need more then exhaust to do that. what other mods do u have?
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Team Owner
Joined: Dec 2000
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From: Phila., PA burbs
Originally Posted by 88BlackZ-51
12.8's.....going to need more then exhaust to do that. what other mods do u have?
You never know................I know of a few L98s with similar mods that are running those numbers and better
Thread Starter
Le Mans Master
Joined: Mar 2001
Posts: 9,464
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From: Modesto CA
Originally Posted by mos90
where is your x brace.. did you leave it off???
Josh,
On the note of True Duals...I did it this way, because I plan to put the cat back on, so it will pass emissions. Also, having the crossover in the system is SUPPOSED to make more power...
Team Owner
Joined: Aug 1999
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St. Jude Donor '10
Originally Posted by TIMSPEED
Josh,
On the note of True Duals...I did it this way, because I plan to put the cat back on, so it will pass emissions. Also, having the crossover in the system is SUPPOSED to make more power...
On the note of True Duals...I did it this way, because I plan to put the cat back on, so it will pass emissions. Also, having the crossover in the system is SUPPOSED to make more power...
Now pray for some good air. 
Thread Starter
Le Mans Master
Joined: Mar 2001
Posts: 9,464
Likes: 1
From: Modesto CA
Originally Posted by bigcityvette
so you have 3 mufflers on your car?
I'll draw up a sketch, in the parts list, it shows all the pipe sizing. It's all 2½", then 3" (single part) then back to 2½".
On the note of the X-pipe and bullet muffler. I wanted to see if it would, because the actual inside of the bullet muffler is 4" (baffling, of course) So it goes from dual 2½" into 3" into a 4" OD bullet, then back to 3" and then out to dual 2½". Just thought I'd try something different, without spending $$$. To tell you the truth, I love the sound, it's entirely different than any other L98 I've ever heard.
Team Owner
Joined: May 2002
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Tim, i wouldn't call it a flowmaster exhaust...
Also, you should post this on every Corsa thread.
There's half of a used cat-back Corsa on ebay that has a reserve above $400, one crushed muffler.
Exhaust systems are WAY overpriced for something without moving parts.
Also, you should post this on every Corsa thread.
There's half of a used cat-back Corsa on ebay that has a reserve above $400, one crushed muffler.Exhaust systems are WAY overpriced for something without moving parts.