I've been doing a lot of research. Like Hardcore said the cat-back seems to be more for sound than anything. I also listened to a bunch of sound clips. I personally liked the sound of the flowmaster the most out of anything I can afford. The hooker sounded pretty nice too. Actually most of them sounded nice it just seemed some were louder than others. I'll do some more research and find one I like and just throw a cutout in with it for better gains. My only question now as stated above is does it really matter if it is a dual 3 inch or dual 2 1/2 inch outlet?

 

No. This wont really limit horsepower. It may make a sound difference? I know changing tips can really change the tone even ... But as far as flow goes, the dual 2 1/2 inchers will flow more than the single cat back 3 inch line does

 

I just put together a nice exhaust for cheap!! I bought a set of 3" intermediate pipes and over the axle for 50$, Dynomax race oval muffler center in and out for 60$, and a bullet 3" to put in the intermediate pipe for 40$. This is going to sound friggin bad *** with my pacesetter off road y pipe. I decided not to go with the true duals I have and go with the stock route of the exhaust as I dont wanna have trouble with the emission guys.

 

Wrong answer dude.....this is not true in the factory "crossflow" muffler configuration. However, if you're talking about, say, the SLP 2OTL, you'd be absolutely right though.

 

I have Mac mids, high flow cats, Y-pipe and SLP loudmouth for an LS1.

It's loud. It's "attitude". You either enjoy that sound and have an aftermarket stereo and speakers, or back down a few decibles to a Borla. I got me .5 second and 4 mph at the track. +15rwhp on dyno.

How come Harleys don't get harrassed by the Sunday noise police?

 

Onebadponcho: Even on an aftermarket crossflow, they will flow so close to what a single 3" pipe does, I would think there is little to no difference. Any name brand aftermarket crossflow with dual 2.5" outlets will flow very similar if not the same as dual 3" outlets. He was meaning the dual outlet size, not what you mean, just the outlets. And this would make such a little differnece its not worth considering.

 

Thanks for the info. I only ask because it seems that there is a dramatic price difference between dual 3 inch and dual 2 1/2 inch outlet systems. The 2 1/2 inch systems cost much less than the 3 inch system. If I went with a 2 1/2 inch system, I could use the extra cash that I would have spent on a 3 inch system on a cutout.

 

I got one more question. I know this will be down the road but I spoke to my friend about headers. The guy he bought his car from told him that in order to put headers in, you have to take the a/c out and thats what he did. He stated its not possible to put headers in an LT1 camaro without pulling the a/c. It sounds like BS but is this by any chance true?

 

That guy is full of crap....

 

NOT!!!!

The only thing we pulled out mainly was; Alternator, Steering shaft, starter, dipstick tube and the AIR connections to the manifold. We put back in; Alternator minus a bracket just because, Steering shaft minus some of the plastic guard pieces, starter, the dipstick after most everything was bolted up (ouch!).

Never touched the A/C. It's still in there and functioning.

http://www.97transam.com/headers.php

 

Why not keep the Flowmaster catback for her during the week, and spend $200 for a DMH e-cutout for you on the weekends? This way, you can choose when to be loud, and when to be mild.

I picked up 6hp and 2ftlbs torque on back to back dyno runs with the cutout open (I have the factory cat-back). It's cheaper than another aftermarket catback, will net you more gains, and you can keep the sound your girlfriend likes with the flowmaster.

Thomas.

 

Thats what I was thinking about doing. I was looking at their systems and thats why I asked previously if there is really a difference in 2 1/2 and 3 inch outlets. They sell both but one is much cheaper than the other. Since its going to be for sound I didn't know how much of a sound difference there would be between the 2 1/2 and 3 inch. I'd just throw a flowmaster in for my girl and throw in a cutout for me and call it a day.

 

It's the same price regardless if you order a 2 1/2" or 3"? The 3" one is a good fit for the stock Z28 pipe. What size pipe does your flowmaster catback have?

Any decent exhaust shop should be able to weld up the 3" flowtech piece into your pipe for about $30. Then you install the valve/motor and wiring harness yourself.

Thomas.

 

I think you should get Magnaflow with an e-cutout.

Corsa has the best sound (IMO) and the best flow (of the single-pipe 3" options), but it's expensive. The previous owner of my car installed my Corsa cat-back, so I didn't have to pay for it. I guess I lucked out.

 

Yes it is a year later, but I own the 95 Z28 in question now. The Edlebrock cat-back he bought sounds like *** and looks like *** (pipes are crap), so stay the hell away from it. I would rather have a stock system than this raspy crap, the thing resonates like hell.