Hey everyone!

I have an Audi A3 1.8T 1999

I want to fit a performance exhaust system!

I hear alot about Milltek being very good!

There is a garage near me which deal with exhausts/fittings, i want to get a straight throw exhaust system from the maifold and de cat. (i know it will fail MOTS's)

However i have a performanceback box lying around at home for a megane whci will fit perfectly and look the dogs dagglies, however i want to know if the smaller bore on the back box makes a difference?

I am a novice when it comes to exhaust so any info will be much appreciated!

Regards Shane