martinss01

ok, it seems the opinions on the ss exhaust is rather varied. ive heard its the first thing you should replace and i have heard that its not worth replacing unless you just want a louder/more agressive sound. so i have questions. first off, is there a different exhaust for the 325 hp package and the 345 hp package? secondly, is there a website where i can actually look at static numbers for the different ss exhausts (assuming there is more than one available from the factory/slp) vrs the "top of the" line from the factory z28 exhaust? that way i can better gauge what i have vrs what is available and whether or not its worth my money.

thanks guys .

gusvette

I have no idea.....
But I hope someone out there does.
I'd sure like to know too.
Gus

Poltergeist

Hmm, I'll give this one a shot. That I know of there are 2 differences between the 325 and 345 (or 335 w/o the airlid) setups. The 345 has a 3 inch I-pipe and a different muffler (or catback if you prefer). The muffler is a very good flowing muffler. I had the 345 package on my SS. When I changed out the muffler for my GMMG I picked up 5 or 6 hp. When I opened my cutout with the GMMG I gain about 5 hp. So a cutout on a 345 package will give you about 10hp.

I don't know of a web site to look at this.

martinss01

thanks poltergiest . i figured there was a difference in the exhaust for the 325 and 345 packages. does anyone know if there is some form of nameing convention difference between the two?

if i could get what slp refers to these exhausts as maybe i could get the info from them. anyone have any guesses? if i do i will post what i learn here. thanks for the help everyone .

all this to find out for certain if an after market exhaust is worth the money .

Teal94Z

i am pretty sure the exhaust option on those were the SLP "Dual Dual" which is a great flowing exhaust....and that with the lid made the 345 version....

PSU 98

Any of the aftermarket exhausts you purchase from SLP should be 3" systems. Any of the aftermarket exhausts you purchase - period - should be 3" systems (save the Mufflex 4"). That's why there are so many different styles to choose from, I would say that performance-wise they are all in the same general range. It mainly comes down to sound preference.

2002Z28SSConv

My '02 SS came with the 335 HP package. SLP Dual Center exhaust with stock lid.

I love it. It wasn't cheap though. Here's a pic in case you're not familiar with them. Under the car it looks pretty much like every other SLP cat back I've seen. But instead of just running the pipes straight back they're longer and run from the normal outside position back into the middle. It may even lose a bit of flow due to this. But it looks cool, sounds great and was on the car when I bought it. So I'm very happy with it.

http://2002.cz28.com/SSlr.jpg

martinss01

sweet, thanks 2002Z28SSConv. link fall down go boom though . getting a remote linking forbiden. do i need to be a member of something to view it?

hmmm, so if im reading the responses correctly thus far it seems that there isn't a cat back system that would be much of a hp increase. sound probably. performance? not likely or marginal. well, that frees up cash for other mods .

thanks for all the replies

BoscoZ28

It seems to flow pretty good. I have it on my Z28. My cars running lean for some reason, so I cant tell if it made a difference, but as soon as i get it runnin right, ill take it to a dyno

2002Z28SSConv

Right click, copy link, paste, enter, view.

I guess I should have said that before.

martinss01

bah! i did try that . oh well, nice car . stupid ID10T errors .

well, we definitly have different exhaust tips if not a different exhausts altogether. did you get anything from gm in reference to what type of exhaust you have? thanks man .