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Discussion Starter · #1 · (Edited)
i'm about to change the exhaust on my RL... i'm wanting to run 3" from the header back with an evo style header... i'm just curious if it's going to throw codes by eliminating the cat??? i don't want to mess things up

evo style muffler!!! gd i can't believe i put header... :(
 

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chances are you will get a code for you HO2S performance. this is because the readings won't be correct because you removed the cat. you will have to get an O2 simulator if you want to for sure not have any codes but thats not gauranting you not getting a code.
 

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just get a high flow cat
 

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we have a high flow cat, specifically the highest flow cat in GM's lineup if i'm not mistaken. "performance" high flow cats are nothing more than cats for larger engines than the one you're using it on...
 

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Vita's absolutely correct on that - also, if you're ever stopped for whatever and the cop looks under your car, or you pass a DOT checkpoint and the guys are bored, they can spot-check you, and you get a $10,000 fine for that 2-3 hp you freed up...
 

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ha a cop spot check a car. Here is how you get around that. Use a reonator where the cat would be. They look almost like a cat. And in my years I have never ever heard of a cop looking for a cat and i was raised by them. And hell my cars too low to see the exhaust.
 

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Both my son's cars have Dynomax high-flow cats, 2.5", only about 10-11" long total, and flow GREAT. They were only $59.95 on Jegs (www.jegs.com).

I live in an area where there's a full blown vehicle inspection for safety and emissions, and even if you have a buddy, they aren't willing to risk their inspection license and business license over your fake or non-existent cat.

If you live in a rural area, or an area where there's no inspection, do what you like. The OBD II system our cars are equipped with, however, detects "catalytic converter efficiency" and can royally screw up your performance, starting, reliability, and mileage.
 

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aaaaaaaaaaa no the o2 on the cat will not affect the cars performance. the o2 on the header does all the work.
 

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Actually, neither of the O2 sensors will affect "performance" if you are looking at it from a full throttle stand point. The ECM ignores both sensors at WOT. They are only used for "normal" opperation of the engine to minimize emitions poloutants.The cat is there for emitions and unless you drive your car at full throttle all of the time it is probably a good idea to keep it there, and help us all breath a bit better.
 

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I know Goofy is looking for maximum power regardless of what it takes, but for most of us, a cat is taking maybe 2-3 HP, like 'sniper' said.... I've seen tests (From the catalog selling the item), of high-flow cats for LT/LS1s that take 1hp. It's not like 20 years ago.
 

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does changing exhaust do anything to the warranty?
 

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louballs said:
does changing exhaust do anything to the warranty?
Not unless you've got a real jerk for a service guy, or unless something gets messed up while its installed or something...
 

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Discussion Starter · #13 ·
sniper said:
Vita's absolutely correct on that - also, if you're ever stopped for whatever and the cop looks under your car, or you pass a DOT checkpoint and the guys are bored, they can spot-check you, and you get a $10,000 fine for that 2-3 hp you freed up...
only good thing there is i live in SC... no inspections...
 

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Discussion Starter · #14 ·
ACasper85 said:
chances are you will get a code for you HO2S performance. this is because the readings won't be correct because you removed the cat. you will have to get an O2 simulator if you want to for sure not have any codes but thats not gauranting you not getting a code.
simulater huh? where abouts would you find something like that? this reallty sucks because every exhaust on every car i've left off the cat... i like the open sound... guess i'll have to take my time on this one because i do not want the cat on
 

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I think you're a little too worried about the 2hp, talk to GoofyGuy, he can probably help you. He's working on getting the O2 sim to work right.
 

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i have tried 2 sims already and still gettin 141 code o2 heater thingy malf. O well I will try a 3rd now
 

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Inspections are total BS, i hate them... I took my old truck in to have it inspected here in GA and turns out my fuel pump voltage something was off and need to be replaced.. so be it. Still didnt pass. Next it was another sensor, then 2 more.. During all of this it was determined that computer was bad and needed to be replaced. After 680 dollars of repair you automaticly get your inspections sticker and are sent on your way regardless of your emissions. Dodge made some money off my truck that was running just fine before all this started. Its all a big scam, revenue for the auto makers that they pretend is saving the enviroment. It was not a dodge dealership is was a local guy that we always go to and trust. He was not ripping on us, i dont think at least. Sorry but you mentioned emissions and got me remebering all this crap.
 

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Discussion Starter · #18 ·
Sp00ner said:
I think you're a little too worried about the 2hp, talk to GoofyGuy, he can probably help you. He's working on getting the O2 sim to work right.
like i said i like the sound i don't care about the 2 hp...
 
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