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 is taking off the centre box affect emmision and MOT?

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denzzz28
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PostSubject: is taking off the centre box affect emmision and MOT?   Wed Mar 31, 2010 8:41 am

im thinking of taking of the centre box and replace it with a straight pipe or a unresonated centre box(if theres one). im thinking it would give extra bhp and make the exhaust sound better. is this a good or bad idea? has anybody here done it or know someone who done it? and last question is will it affect the emmision?
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IAN74
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Wed Mar 31, 2010 8:48 am

it will make it louder mate . not sure on mot etc as cat sorts emmisions out so i thought it would be if its to loud db wise to pass . and would you lose to much back pressure to gain bhp.
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denzzz28
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Wed Mar 31, 2010 9:08 am

im confused, how many cat does the zafy have? as far as i know from the manifold there is a big round catalytic converter then after that the centre silencer box and then the rear box. ive also look under the car during the rear box fitting and those are the only components i can see on the whole system. does the centre box also act as a catalytic converter too?

and about the back pressure, ive read about it in some forum but i cant remember where. the guy who was a mechanic said back pressure only applies on two stroke engines such as motor cycles but it doesnt really apply on car engines and motor cycles with similar engine layout.
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tomZ20LET
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Wed Mar 31, 2010 10:34 am

it will add about 0.5 bhp lol and fail an mot on noise polution depends on the mot tester tho
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IAN74
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Wed Mar 31, 2010 10:54 am

thanks mate that sorts that problem . i thought it was sound wasn't sure on the pressure bit
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tomZ20LET
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Wed Mar 31, 2010 11:16 am

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supersterl
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Thu Apr 01, 2010 5:53 am

many people do it.... it wont affect the emmisions...

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Drives a Zafira GSI Turbo..in Arden Blue
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tomZ20LET
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Thu Apr 01, 2010 6:44 am

depends on the mot tester if he fails cos of noise polition my mot tester will fail it!!!!
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madgezza
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Thu Apr 01, 2010 6:48 am

tomZ20LET wrote:
depends on the mot tester if he fails cos of noise polition my mot tester will fail it!!!!

glad i dont take my cars there lol
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tomZ20LET
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Thu Apr 01, 2010 6:54 am

lol i dont take my cars there lol
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madgezza
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Thu Apr 01, 2010 7:03 am

my s2 would defo fail with him.
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denzzz28
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Thu Apr 01, 2010 8:05 am

ive been with my mot tester for 6 years and so far he didnt fail me, he did let me off several times with (wornout tyres, blown rear lights, thin brake pads). but im not sure if hes gonna fail me with a noise pollution? lol!!
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zafgsi
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Sat Apr 10, 2010 3:40 am

With regards to back pressure, turbo cars go better without back pressure but N/A engines need back pressure. I don't know the in's and out's of it but any decent tuner should be able to explain more.
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PostSubject: Re: is taking off the centre box affect emmision and MOT?   Today at 7:15 am

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