im having an exhaust made soon & wondered what the ideal bore size would be. any advice plz

I think 3" is best if you can fit it.

i thought that but talking to sumeone they reckon 2.5 wud be better for torque

ive a bit of a mongral with a 3" de-cat and a centre section of 2.75". seems to be fine in talk terms.

depends on what you want

if you want torque but hinder top end go for a 2.5"
if you want more bhp but kill some torque lower down then go for a 3"

But my opinion is 3", you wont reget in doing so

right basically i want acceleration as the engines in a punto so top end wont be that safe.
sp looks like 2.5 for me then thanx for the quick replys