exhaust gains
exhaust gains just want to see if anyone has swapped cats from a 02 camaro to a 99. i recently installed some 01-02 headers on my 99 ss and modified the stock cats to fit. i noticed that the 99 cat pipping is real small from the inside like 2 pipes are in the 2.25 inch pipe. i wanted to get stock cats from a 02 because of this and so i can bolt up my slp y pipe to it.
just want to see if anyone has swapped cats from a 02 camaro to a 99. i recently installed some 01-02 headers on my 99 ss and modified the stock cats to fit. i noticed that the 99 cat pipping is real small from the inside like 2 pipes are in the 2.25 inch pipe. i wanted to get stock cats from a 02 because of this and so i can bolt up my slp y pipe to it.
unless you are in California, than you should not have an issue with Long tube headers, catted y-pipe and all emissions equipment. even some places in Cali wont care if you have the longtubes, but others will. as long as you get the cats right after the headers, then it should pass the sniffer.
You are just wasting your money doing a cat swap using factory cats. Does your inspection criteria require a visual inspection? if not, get a set of long tubes and a catted y pipe with a quality set of cats. There are thousands of guys passing smog like that. If your state requires a visual inspection then I don't know what to tell you. And shorty headers are pretty useless. Factory manifolds practically flow as well. And the SLP y pipe you have is a joke as well. These cars need long tubes and high flow cats, or an ORY if you so choose. Like I said, I don't know your exact requrements but there are guys on here that run long tubes, catted y pipes, any catback you can think of along with a nice set of ported heads and a pretty nice bump stick and are passing smog inspections.
yeah im in california its a good thing i paid about 100 bucks for everything that i got. i know longtubes give alot more power i just dont want to worry about driving the car and running into a random smog check point and get screwed.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
12 Second Club
Joined: Sep 2005
Posts: 4,273
Likes: 0
From: Bucks County, Pa.
got everything put on it sounds better, it pulls more when u give it gas. going to the track to see if it actually made a difference or its just in my head. my best pass in the 1/8 so far has been a 8.5 @ 83.8 mph on the stock tune. hopefully i can get a low 8 after a tune.
got everything put on it sounds better, it pulls more when u give it gas. going to the track to see if it actually made a difference or its just in my head. my best pass in the 1/8 so far has been a 8.5 @ 83.8 mph on the stock tune. hopefully i can get a low 8 after a tune.
12 Second Club
Joined: Sep 2005
Posts: 4,273
Likes: 0
From: Bucks County, Pa.
12 Second Club
Joined: Jun 2012
Posts: 1,548
Likes: 1
God bless ohio. So long as my plates are current, i can run anything i want with no worries or checks. As long as ur not waking the whole town at 3am with noise, nobody cares. Heard about vehicle inspections, but been driving 17 years, and never seen 1 , ever.
12 Second Club
Joined: Sep 2005
Posts: 4,273
Likes: 0
From: Bucks County, Pa.
Because they are not in the stock location (with headers) and therefore not close enough to the exhaust ports for quick enough 'light-off', and even if one kept the stock manifolds and welded the high flow bullets into the down pipe (in place of the OEM style catcons), they would not convert enough of the exhaust gasses to meet the Cali/50 state ECM's threshold (as measured at the rear O2), with out a tune which writes out the 420/430 codes.
Then they just WILL NOT pass a visual in the 'commie' (as so many on here would label them) states.
Then they just WILL NOT pass a visual in the 'commie' (as so many on here would label them) states.
i got some updates with the shorty headers 02 cats and slp y pipe i gained 1mph in the 1/8 i now trap 85 best pass so far was a 8.40. it might now be much but im not planning to go crazy with this car with mods just a fun daily driver. now im going to add a ls6 manifold and get it tuned looking to get a low 8. if that doesnt get me there some 4.10 gears will help. still have the stock 3.42s car is a m6.
