Strange - looking at my previous write-ups my supersprint race-system was 2.25", compared to the 2.5" of the Milltek.
 
Supersprint race system is 63.5mm which is 2.5". Street system is 54mm which is 2.125".

Hi people, mine is the race package so it will be the 63mm pipes i measured the diameter with a ruler to make sure (sad i know) and it was spot on!

I have a friend who works 4 a garage who is great so im sure it will be made all good!!