Headers & exhaust

[TomZR1]

I have 90 zr1 bought it 5 months ago looking to up grade exhaust ,like to do headers is it woth the money & noticeable hp Gaines & what brand, wher to get em. What about mufflers or cat back system? I think resanator is stock,Car has flow master mufflers they look ugly looks like 4 tubes coming out of the rear, correct me if I'm wrong stock resonator has no cuts going to y pipe it's all one ,mines cut with clamps to muffler with clamps, resonator has no markings so I'm guessing stock sounds good but looks like crap.any info or pics would greatly appreciate it thanks.

[WARP TEN]

Originally Posted by TomZR1

I have 90 zr1 bought it 5 months ago looking to up grade exhaust ,like to do headers is it woth the money & noticeable hp Gaines & what brand, wher to get em. What about mufflers or cat back system? I think resanator is stock,Car has flow master mufflers they look ugly looks like 4 tubes coming out of the rear, correct me if I'm wrong stock resonator has no cuts going to y pipe it's all one ,mines cut with clamps to muffler with clamps, resonator has no markings so I'm guessing stock sounds good but looks like crap.any info or pics would greatly appreciate it thanks.

Welcome to the group, tom. I would suggest a look at Marc Haibeck's website to give some ideas of power increases. http://www.zr1specialist.com/. Long tube headerrs are under "Products" and there is a presentation on exhuast systems from the 2011 BG gathering. Do you need cats for emissions? Long tube headers add about 25 hp, and a Corsa exhaust adds about 10 or so. You can get high flow cats but they do slightly reduce power, maybe 5-8 hp. Stainless Works and OBX (SW knockoffs) are header possibilities. Marc says Corsa shows the best power gains but others are close. --Bob

[We Gone]

The best way to tell if you have a stock resonator is two pipes in two out, the Flowmaster resonator has both pipes join into one 3" pipe at the inlet than 2 out.
I did my header Stainless Works coated long tube as my first mod many years ago 08 and was very happy with the results. They have held up very well still look great. I have them hooked to 3" high flow cats and Corsa passes the treadmill test for emission with no problem.

[TomZR1]

If reasanateris stock ,is there hp to gain if replaced with b&b or corsa.

[TomZR1]

Don't need converters ,so headers ,full exhaust will gain about 35-40 hp .

[TomZR1]

Don't really like tips on these after market mufflers,maybe can do flowmaster with single outlet & 95 tips. Lets go back in time does any one remember flowmaster had a cat system 3inch exhaust with 90-92 tips

[We Gone]

Tom,

I just took the old type ZR-1 cat back Flowmasters off they do not sell it anymore. I'm putting on my LT1 car.

[We Gone]

Originally Posted by TomZR1

If reasanateris stock ,is there hp to gain if replaced with b&b or corsa.

Not sure about B&B but the Corsa system only comes complete as a cat back set up. When you buy the SW headers you can get an adapter to hook from header flange to pipes with out cats.

http://www.stainlessworks.net/1990-9...onn-point.html

[WARP TEN]

Originally Posted by TomZR1

If reasanateris stock ,is there hp to gain if replaced with b&b or corsa.

If your resonator is a stock 90 unit, there are gains available. Marc's presentation on exhausts clearly demonstrates that. --Bob

[edram454]

I think long tube headers are well worth it. Very good gains throughout the whole rpm range and especially high rpms. The previous owner of my car bought the DRM ceramic coated long tube headers and he put the flowmaster force II exhaust system on it. He lived in pennsylvania and he had to pass emissions so he took the cats off and put the flowmaster resonator which he convinced them were cats. This car passed emissions every year and the stickers are on my windshield to prove it. the car sounds great with no mid rpm drone that most systems have. the corsa's sound tinny, ratty and the horsepower gains are not substantial and debateable. Unfortunately you cannot get the flowmaster system any more so you would have to make choices here. Definately get long tube headers if you want to really take advantage of your ZR1's power. I would go for the best sounding system as far as cat back exhaust is concerned. You are not talking a bunch of horsepower difference here. the gain in horsepower will be with your long tube headers. get the best sounding catback and dont get caught in that 1 horsepower or 2 horsepower counting game that most manufacturers want to you believe. does it matter if your catback makes 2 horsepower less on a particular day and on a particular car anyway... it just has to sound the way you like it.

edramos #3028