I have a standard exhaust for a 2003 Boxster S that I have applied the CRIOS mod to (search for CRIOS if you are not sure what this is). The drilled holes are 25mm and it sounds very good but unfortunately caused a bit of drone on my Tiptronic (the revs on a Tip stay mostly in the 2500 - 2800 region). I therefore replaced it with another exhaust that I got from a breakers yard. The exhaust is in good condition and had no rattles when it was on my car. If you want to try the CRIOS mod but don't want to drill your existing exhaust then this is a cheap option for you. It's for sale for £50 (it cost me more than twice that for a replacement that wasn't in as good a condition).
Collections from Sevenoaks in Kent, United Kingdom only
