Exhaust system sizes

[Jonny1]

What's the most popular bore size for exhaust system on a fairly hot Williams (220-230bhp mark)

Anyone had the fortune to try different sizes?

What size you using on yours Stan?....

[clowo16v]

Depends whether its n/a or turbo. If its turbo I would go for a 3" system at least, n/a probably 2.5-2.75".

See ya

Matt

[Clio_GTT]

no more than 2.5 " NA as you'll need a bit of back pressure, Forced induction - anything reasonable aslong as its not too big 3" max i'd say

[Jonny1]

Sorry, I wasn't that clear. It's for a NA.

Thinking along the 2 1/4" route, wanted to do some simulation first to give me a clearer understanding of mass air flow and then work around that etc. But I bought the car with a after market system and it's doin my nut, so gotta change it soon!

[Clio_GTT]

Most of the aftermarket systems are 2.25", the magnex etc

for that sort of power 2.5" is probably better

[Gav]

i had a 4" powerflow one, to loud, to chavvy, now i hve a nice small magnex one off matt brown, not to sure how big 2" or somethink like that

[Martin]

i had a 4" powerflow one, to loud, to chavvy, now i hve a nice small magnex one off matt brown, not to sure how big 2" or somethink like that

You're talking about tailpipes right lol
4'' bore might be ok for a skyline but no a clio!

[stew]

i had a 4" powerflow one, to loud, to chavvy, now i hve a nice small magnex one off matt brown, not to sure how big 2" or somethink like that

You're talking about tailpipes right lol
4'' bore might be ok for a skyline but no a clio!

Haha. We were speaking about the pipe diameter of the system not the tailpipe. Normally 2-2.5inch! The tailpipe has very little effect over backpressure of the system - unless its huge and there are no baffles!

[Gav]

sorry lads, my mistake

[stew]

hehe, easy mistake! its all most folk talk about is the tailpipe.