jetex cat back/or no cat

[p34ch3y]

got a jetex cat back system

if i remove the mid cat n make it strate through will i get more power

would it be legal to do it i dont know how the law stands on that sort of thing also would it make the mot ok like that

 

[acidstrato]

its a cat...back...so u mean remove the mid silencer (the cat is on the downpipe, hence 'CAT BACK')

and that is perfectly legal, and will increase sound, but unlikely to make much more power, maybe a tiny bit

now.. replacing the downpipe and cat (which connects to the 'cat back' system) with a straight through pipe (a decat) would make it illegal and probably fail the mot emissions test

it would also cause a few problems without the right remap

 

[p34ch3y]

thanks again for your help m8

would just replaceing the down pipe be legal n all that

 

[acidstrato]

yeah thats fine, cos the cats built onto it... i have done so (milltek downpipe and sports/race cat)

downside is that cos they come with a new cat, they are expensive

if u got/get revo stage 2 for example u wont get car problems by removing the cat, but supposedly u will fail the mot, so u either gotta put the cat back on, or go to a 'friendly' mot tester who will ignore it

but it really depends whether u meant remove the cat, or remove the mid silencer of the exhaust system

 

[p34ch3y]

removeing the silencer m8 the mid one

 

[acidstrato]

yeah thats perfectly legal but doesnt add up to much...i know supersprint do a straight through pipe on one of their systems

but really the biggest difference should be noise and little performance gain

 

[Beaker™]

I have a jetexcat back with the mid silencer removed, and to be honest its no louder than other 200+bhp Ibiza's with similar exhaust set ups.

 

[lcjay]

just brought a jetex with the silencer as i spoke to my friend who runs a mot cetre and he said you could have problems getting a mot as they state it must sound like a standard vechcle also they can fail it on incomplete system,hope this helps

 

[Beaker™]

they state it must sound like a standard vechcle

What about all the chavs with 4" jap back boxes, they sure as hell don't sound like a standard vehicle!.

 

[acidstrato]

never heard that before, sounds like rubbish to me

is there even a noise restriction? as my mot tester checks emissions and nothin else to do with the exhaust

 

[Beaker™]

as my mot tester checks emissions and nothin else to do with the exhaust

Thats all they ever do on my cars too.

 

[acidstrato]

surely its never gonna sound like a standard car with any aftermarket exhaust

get a new tester is my advice...someone who knows what theyre talking about

 

[lcjay]

only what i was told.if you fancy chancing its your choice.like i say they can fail it on incomplete system too,if they like if it is straight through to the back box

 

[20vtdave]

as long as your car doesn't fail on emmissions and has the cat put back on before the mot it can be up to 110 decibels and will be fine, you CANNOT fail for an incomplete system, as long as there are no leaks and all the exhaust rubber mountings are still there, even if it is louder the tester won't take it past fast idle (about 3,500 revs), so if its a good exhaust it shouldn't be that loud. I wouldn't take the cat off as turbo engines are low compression anyway and could cause the ecu light to peck your head a bit as it could read a compression failure.