http://www.uucmotorwerks.com/html_produ ... uemyth.htm
So i came across this a but ago and had a read through
Ive always thought that you needed back pressure as when a mate of mine removed his middle box
It slowed down quite a bit.
Anyone know a bit more on the subject?
Backpressure myth?
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LSKSK
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Backpressure myth?
T reg 1.0 12V corsa b called...Mikey!! 
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Jimi137
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Re: Backpressure myth?
i wud also like 2 know a bit more about this subject as well - in my corsa i fitted a huge backbox and took the middle box out and didnt notice a drop in power but there might of been a subtle loss. wud like 2 know as i love the noise even a small engine makes without a middle box and wud be looking at removing the one on my next car as well
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lilmizqueeni
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Re: Backpressure myth?
think it depends on exhaust. i had the middle box and cat took out. didnt notice any difference.. apart from the sound.
Red corsa 1.4 sport & Arden Blue Astra Gsi