De-cats


gaza4

gaza4

New Member
Joined
Apr 17, 2010
Messages
124
if i replace my standard cat with a straight pipe decat will it make my car louder???

i was in one of the performance shops near me and was asking bout a cat back system and he offered me a deal of a half price decat and free fitting with a skunk2 system. i said i didnt want a decat coz i wanted to keep the car quietish but he said decats dont affect noise. i was always told they do so now i dont know!!!

tl:dr will a decat make a car louder or not???
 
Well i know for a fact my exhaust increased noise when i removed cat and replaced with a resonated De-cat pipe.
 
I'd also say it changes exhaust noise !

I even had a baffled decat not just a pipe and it was alot louder.
 
I've had mine fitted within the last 2 months, it does make it louder but not by a great deal, however i am still running a stock system with the decat.
 
i found it made it a small bit more raspy not a huge amount louder though
 
Nah my exhaust isnt raspy at all. Just loud lol.
 
lol cheers dan. I've heard a few people say that a decat, even the resonated ones can make your system really raspy. I'm a rasp hater though....I'm more into a more deep mellow exhaust note:cool:
 
D'janiero said:
lol cheers dan. I've heard a few people say that a decat, even the resonated ones can make your system really raspy. I'm a rasp hater though....I'm more into a more deep mellow exhaust note:cool:
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Tends to be adjustable cats that make it raspy. Straight pipe make for f'in loud race car volumes and mental VTEC sound but sound a bit poo low down. Bit farty... Resonated is the way forward if you want a decat but i'd keep your cat on. Waste of money imo. Don't think mine feels any different really. Escpecially not on JDM cats anyway.
 
ijwhiteman said:
Tends to be adjustable cats that make it raspy. Straight pipe make for f'in loud race car volumes and mental VTEC sound but sound a bit poo low down. Bit farty... Resonated is the way forward if you want a decat but i'd keep your cat on. Waste of money imo. Don't think mine feels any different really. Escpecially not on JDM cats anyway.
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Dyou think you would notice any gains through mapping after a decat dude?
Say for instance a b18c with I/H/E with a decat and s300 compared to a b18c with the same mods but with the stock cat left in place?
 
D'janiero said:
Dyou think you would notice any gains through mapping after a decat dude?
Say for instance a b18c with I/H/E with a decat and s300 compared to a b18c with the same mods plus s300 but with the cat left in place?
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Definitely. Because you'd be mapping the ECU to give it more fuel. The cat would then become a restriction big time. Where as on Stock ECU even my Spoon is running LEAN not good. so i'll be putting my cat on to richen it back up a bit.
 
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