I merely stated that a cat back 3" exhaust does not have enough
backpressure and causes undesirable resonance with a stock motor with
stock manifolds and cat. Changing my muffler merely removed the added
restriction. Retaining 2.5" maintained correct backpressure to avoid
resonance. True, Changing to headers, hi flo cat, and MAYBE larger
pipes would have yielded more gain.
My results: (no power braking involved)
Stock - floored of line - negligable tire spin
K&N FABM - - about a 6 second smokey burnout
Flowmaster - nothing but smoke well into second gear
SG mod - about a 3-4 second burnout then traction
Sounds to me like I improved horsepower then added traction.
Comments?
Joe Borg
______________________________ Reply Separator _________________________________
Subject: Re: DML: Gibson exhaust installation
Author: <dakota-truck@buffnet.net> at internet
Date: 2/19/98 8:32 PM
Joe,
Flowmaster is trying to sell Flowmaster. What youwere told doesn't compute. If
the Y
pipe and Cat are the major restriction opening up the exhaust system after the
cat
would have negligible effect.
I have a 94 Sport with the 5.2, 5spd, and 3.90 gears. I've had the truck since
new
and have had it to the track a few times. The most marked single improvement was
the
Gibson cat back exhaust with a set of JBA shorty headers which use the factory Y
pipe. I picked up 2 mph at the strip and 2 mpg on the road with this
modification.
A few years ago CC did a 2.2 turbo package called the Super 60. The development
was
done on a dyno and with mufflers and the Dynomax Ultra made 20HP more than the
Flowmaster.
KW
Joe Borg wrote:
> Jeff, I recently called flowmaster. They stated with minor mods, the
> stock exhaust system is more than adequate when a flowmaster 2 chamber
> muffler is installed. They stated 3" pipe does not have enough
> backpressure and although sounding "meaner" woulsd actually slow you
> down. The concept of single in dual out mufflers is pure show and no
> go. An exhaust system can only be as efficient as its weakest point -
> the 2 into 1 y pipe and cat. Unless you install 2 cats with a true
> dual setup you are gaining nothing but sound and appearance. Joe Borg
>
> ______________________________ Reply Separator
_________________________________
> Subject: DML: Gibson exhaust installation
> Author: <dakota-truck@buffnet.net> at internet
> Date: 2/17/98 3:09 PM
>
> snip
>
> Does flowmaster make a similar kit?
>
> Thanks.
>
>
> jeff
> 98 RC 4x2 V8 5spd 3.55SG flares
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