Exhaust Decibels

[Get EPIC]

Hey guys,would replacing my x-force cat with a decat pipe make my car louder or change the exhaust note at all?

[R31Nismoid]

Yes. Less restriction = more noise... a cat does soften the noise somewhat. I can notice a large difference.

[Get EPIC]

Yes. Less restriction = more noise... a cat does soften the noise somewhat. I can notice a large difference.

thanks nismoid . im gonna chuck my decat in after dinner. This kakimoto exhaust is way too quiet

[MrStabby]

Remember decat is illegal for the street, and its expensive if you get caught. Cant remember which state it was but someone posted about a $4500 fine recently. Besides which it makes the pollution from you car much worse, so you've got to be a bit of a prick to run one...

[Drakey]

What about performance gaines? much in it for the fine its worth?

[HEKT1K]

would you pay $4500 to gain like 5kw?

thought so...

[bozodos]

dunno bout you guys but I've never heard of anyone getting a fine for a decat, I mean how do they prove that the cat hasn't just collapsed and been spat out of the exhaust?

[Adriano]

Because you have a decat pipe, ther is no cat to spit out.

[R31Nismoid]

lol... funny how when logic is applied it brings with it the light.

a decat pipe can give performance, depends how restrictive your current CAT actually is

[bozodos]

Oh I always thought you'd have to be an insane idiot to actually run bare pipe without even the pretense of a cat shell lol.

BTW the EPA tester the other night could tell my cat was empty from listening to it, they do give things a bit more of a barkm not to mention a hard to describe sound of the turbo spooling.

[joeyjoejoejuniorshabadoo]

i run a decat, in a cat shell... it is pretty loud

[Parag0n]

I went from a straight through to a magnaflow cat, not much difference, both sounded quite loud.

[ONE-VIA]

ive wanted to chuck a de cat on my na shitter for a while but its loud enough and im broke so i might punch out the stock one so it still looks legit

i reckon im near the 100db mark atm with just a cat back

[R31Nismoid]

And the rest

[trel]

i ran a decat pipe for ages, didn't notice that much of a gain, plus the extra loudness and having to polish my rear bar all the time did my head in.

[Vanilla_Rice]

Besides which it makes the pollution from you car much worse, so you've got to be a bit of a prick to run one...

There must be a LOT of pricks over here in NZ then

[bozodos]

haha well with an RB25, hollow cat and no mufflers I got an average of 110db and a max of 128, but you get used to the noise and its only at random times like when you're driving down an alley or being emissions tested you realise 'oh dear thats loud as fark', fyi I'm going to go stealthy exhaust route now (at least most of the time lol)

[Pattygtst]

I put a decat on my x-force system. Hardly noticed any sound difference at all.

you got to find it to fine it. You always get a chance to replace with a cat before they look at it even if this so called 4.5-10k fine exists.

[Drakey]

Spoke with the Vic EPA today. They said if your caught you will get a summons to go to court. and its frowned upon pretty bad

but couldnt confirm the fine, thats worked out in the court system

[Get EPIC]

OK.Did the decat pipe experiment.Noticed a little increase in performance.The exhaust note was maybe 5 decibels louder but had an awesome throaty sound when on boost,absolutely loved it.Did notice how noxious the fumes were though,so after 2 days of driving i put the cat back on.I've decided instead of getting rid of the cat i'm going to get rid of the mid muffler.The kakimoto exhaust i have has the big oval muffler at the back and between that and the mid muffler i can hardly hear the exhaust!Cheers for all the input and replies fellas.