ricklovin93

iTrader: (1)

I have a 88 sport coupe with LO3 v8 im looking at catback exhaust systems whats the largest diameter that i can use on the stock engine? and is flowmaster all that its hyped up to be or is there a better company for horsepower gains?

85_ZED28

Welcome to thirdgen.org!

The largest? Well, you can buy 3.5" or even 4" catbacks for our cars.

However, 3" is the most popular size and would work well with your stock engine.

HP won't change much depending on your muffler choice so just choose what sounds best to you. For what it's worth, flowmaster seems to test on the low end for flow, at least the 80 series. There are lots of options out there. Try a search on here, or also youtube for sound clips. I'm currently replacing my flowmaster muffler with a hooker aerochamber to try something different.

ricklovin93

iTrader: (1)

does a dual outlet muffler provide better flow because I like the almost sleeper idea of a 3in but with only one outlet

SKELITOR117

iTrader: (3)

If your not planing on swapping out your engine, or if your just looking for another cat back, 2 1/2" should be fine. You wont start experiancing restriction until you reach 230+hp. here, this is an earlier post I did. It's conmpletely bolt on. No weilding necisary.

Got an entire catback exhaust system w/superturbo muffler (DUAL SPLIT EXIT INCLUDING THE TIPS) for $110 shipped TO MY DOOR! I GOT A COUPON CODE FOR $10 OFF AT www.streetsideauto.com AND THERE IS A $75 DYNOMAX EXHAUST REBATE GOING ON UNTIL AUGIST 31ST.

Here is the press release which states purchases until 8/31/2011 can get the $75 rebate

http://www.dynomax.com/press_release...mail-in-rebate


and here is the link to streetsideauto.com for the system. Free shipping, $202 price minus $75 rebate = $127 to your door. I don't know why anyone would run a stock system any more. Don't beat the dead horse which is discussions about exahsut this and exhaust that. For $127 what do you have to lose? [PART #17495]

http://www.streetsideauto.com/p/dyno...at-back-17495/

you can try coupon code Q3102011 and you will get $10 more off the price. Remember, a rebate comes from Dynomax so you pay streetside the total and then get the rebate. So, if the $10 off works the total out of pocket could be $117. Quote from torque_is_good.

I personally got the one for $195.99 (part #17493). Paid $185.99 cause of the coupon, and when I get the rebate Debit card (mail in) I will have only paid $110 out of pocket for a complete 2.5" cat back exhaust with super turbo muffler with dual split exit tail pipes. All hangers and mounting brackets are included. Perfect for your 3rdgen 2.8 or 5.0.

Rebate works with all Dynomax performance exhaust systems, but the $10 coupon code works only at www.streetsideauto.com.


here is the link to the rebate.
http://media.streetsideauto.com/abso..._RebatePad.pdf

one92rs

iTrader: (5)

i had a stock 305 and went to a 3" magnaflow cat back system with no cats, hooker headers and ypipe. still stock besides ultimate tbi and a chip. but the catback will support my ls1 when it is installed. so i suppose if you are going to be keeping it stock with bolt ons then go 2-1/2/ if you plan to upgrade later in the not so distant future then go bigger now.

85_ZED28

A single in, single out will typically flow better.

SKELITOR117

iTrader: (3)

But doesn't look as cool. And the Dual out flows fine. Especially for this engine. it's no fire breather, that's for sure.