ZZP Downpipe?
 

I know this has probably been asking 500 times but I am new. I looked all over for a post and did not see an exact answer. I was looking at the ZZP site at getting a downpipe and was wondering what drop down settings to pick when I go to order it. OR if there is a better option for doing the u-bend delete since I plan on getting a cat back system soon. (Would I be better off with the downpipe with the cat for a better high flow cat.) 02' Monte Carlo 3.8 with stock exhaust so far. THANKS!:)

Since your N/A, I'd get the 2.5 inch bolt in with cat. They come with magnaflow high flow cats so its a pretty good cat. I just installed the 3 inch with cat on our 04 SS Supercharged and its a really good pipe

if you are planning on a cat-back the zzp downpipe will be a better option. the downpipe area is the most restrictive part of the exhaust system. you should get better gas mileage which will let it pay for itself.

http://i33.photobucket.com/albums/d5...Picture1-3.png

you want that.

But be aware that many of us that have the ZZP downpipe with high flow cat that haven't gotten a tune or a PCM from ZZP yet do throw codes.

He has an '02, so there are many options for getting rid of the code if need be.

Ah yes the O2 emulator.

I actually just ordered a PCM from 3800perf I guess we will see how that goes I thought I saw on the 304 stainless option that there was a bung for the O2 sensor so would that still throw a code?

The code is because the O2 sensor on the car is reading after the cat. When you replace the stock cat for the high-flow the computer thinks something is wrong because the huge restriction is gone.

Even a new O2 sensor doesn't fool the computer.

Well THANKS everyone for the info I guess I will have to do some more looking before I order THANKS for the info!

PS- I will get some more pix up soon of my monte the ones I have up do not do it justice I have done many more things to it since those pix.

I own a 2002 MC SS, N/A L36(very modded) and have driven with a 3" in/2.5" out, Random Tech(R/T) downpipe for 3.5 years and stock cat-back. The first 2 years was with a stock PCM. Never threw a code. Now if you use a version without a cat(off road), then yes, you will throw a code. If you simply disconnect either O2 sensor and drive that way, you will throw a code. And, maybe, a 3" inlet/outlet might also throw a code, but that might depend on the cat type and still be rare. A 160-degree T-STAT will also throw a code. Even just a CAI, ST1 TB, headers, too-cold plugs and a 180-degree T-STAT, has thrown codes. It’s usually your combo of mods, not simply the downpipe.

to the original poster, you should look in the classified here on this site. i have a really cheap setup on the exhuast side for you! people can vouch for me. ceramic coated plog to keep engine temps cool and allow more free flowing exhaust....great for N/A 3800's. ceramic coated crossover pipe to keep your IAT's down, and a 2.5" bolt in downpipe w/ high flow magnaflow cat.....all ordered from zzp about a year ago all in great shape. $400 for everything + ship, or $300 + shipping for everything if you give me your stock downpipe and cat. the only reason for the stock dp is because i have smog in california and need it just for smogging. kind of a waste, only need it for a day but my loss is ur gain.
since im supercharged, i've decided to go with headers instead of this setup. it'll be better for me.
these parts new are worth about $600.

let me know. heres the link to my thread:

https://montecarloforum.com/forum/sh...ad.php?t=17230

p.s. the main code you'll see is the P0420 code, with means cat is at its threshold. if you purchase a pcm you can ask for it to be tuned out, meaning it will never throw that code after that. i had that done to my pcm before i even installed anything. pretty simple.