Purdy1984

iTrader: (1)

Currently have a PPP sports cat and 2.5" system non res and I'm looking to get a 3" open mouth downpipe to go with some other mods. My question is is there really much performance gain in a full 3" system compared to a 3" reducing to 2.5" after the downpipe? Prefer not to replace it all unless there is a real need.

Thanks

Paben

iTrader: (5)

Unless you've got the mods to go with it the full 3" system could even reduce power. I ran 2.5" all the way to 425bhp and there's plenty of higher power cars still on 2.5".

Purdy1984

iTrader: (1)

I'll be fitting new injectors, turbo etc to get close to 400 hopefully and need to get the decat just wasn't sure if to get a full 3" and have to replace it all or get a reducing one and save some expense if not reduced.

Cheers

horsham rc

iTrader: (1)

Interesting. I'm in the same boat I am going 450bhp I have a 3" from turbo down to a 2.5" centre then to a 3" back box. Have been advised to change the centre to 3". So any more info on this would be great.