Aside from MAC, does anyone make a true bolt on 3" cat back?

STREETFIGHTER50 · Dec 26, 2006

Need to go with a 3" exhaust for my 90 LX. Anyone other than MAC make a 3" true bolt on exhaust kit?

dmeads311 · Dec 26, 2006

Flowmaster makes a 3" system that comes with the 3" x-pipe as well. I saw it in a Jeg's catalog

SonicB · Dec 27, 2006

Lot's of 3" components available, a Google search should yield many options.

BTW - If you are making less than 450hp I would not consider a 3" exhaust at all.

85GTlover · Dec 28, 2006

I was going to say same as above unless you plan big hp in the future the 3" is likely to hinder performance rather than improve. A nice mandrel bent 2.5" is all you really need. But there are ones out there, likely pricier but out there. Goodluck .

ShortThrow50 · Dec 28, 2006

dont you need some backpressure?

STREETFIGHTER50 · Dec 28, 2006

Well, the car made 410RWHP/410RWTQ recently on a Dynojet. The combo is a 10.7:1 compression 347 w/C&L 76mm MAF & elbow, 70mm TB & EGR plate, FMS 30lb injectors, RPM II intake, custom cam w/244/236 duration & .580/.555 lift, 1.6 Pro Magnum RR's, AFR 185's w/polished exhaust ports, BBK 1 3/4" LT's, Dr. Gas 2.5" X, & 2.5" Spintechs dumped.

I have these parts sittin in my garage that I will be swapping on soon:

80mm C&L MAF
Vossperformance Race Induction 3.5 pipe http://www.vossperformance.com/pictures001005.jpg
FMS 36lb injectors
Accufab 75mm TB
UPR 75mm EGR delete plate
RPM II upper-port matched for the 75mm TB & tapered in
BBK 1 3/4" LT's opened up to a 3" ball collector
Dr. Gas 3" X-pipe

Also, I may run 42lb injectors & try to fit a 3" MAC Pro-Chamber instead of the Dr. Gas X.

Grn92LX · Dec 29, 2006

The mac prochamber wont work with the bbk longtubes unless you have it made to fit at a shop or something. 3" is a smart move. Dr gas is your best bet IMO.

MYSTICSVT · Dec 29, 2006

SonicB said:
BTW - If you are making less than 450hp I would not consider a 3" exhaust at all.

How about using a 2 1/2" mid-pipe with a 3" after-cat on a reasonably stock motor? I'd like to go with a 3" after-cat mostly for aesthetics and a little more growl.

To the original poster, sorry for the hi-jack.

:SNSign:

Aside from MAC, does anyone make a true bolt on 3" cat back?

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