John at 42DD told/confirmed this with us, which I basically understand is:
3" DP is best for performance.
But with the Cat Backs, it's more of a choice:
3" will give you a bit better top end power, kW on the dyno, but rob a little low end power, and it'll be noticeably a bit louder.
The 2.5" will give a bit better low end power, losing a little top end, and be noticeably a bit quieter.
I'll try to find the actual quote from him, but I think that sums it up.
You really should've jumped in with us on that 42DD buy, we ended up getting 35% off!! The offer was meant to end on Tues USA time, but if you emailed them now you could maybe still jump in! ... You could maybe also jump in on shipping with one of the guys on here that's getting their exhaust sent to near you anyway... My full turbo back 3"-2.5" 42DD exhaust is only costing me about $1050 AUD, to my door! And that's including about $400 AUD shipping!!
Maybe just grab a 42DD 3"DP right now, and then get a varex muffler from elsewhere? I love the idea of those things! And that is probably why nearly all of us in the group buy got the 2.5" cat back, just that bit less unwanted attention from the boys in blue and judgemental frowners. >-( ..aka: the haters!
Dark Grey Mk4 Golf, 1.8T GTI conversion, APR stage 1, stock air intake, FMIC, 3" to 2.5" Exhaust, FK AK Street Coils, Black 18" (Avant Garde M310's ?), tinted tails, ...
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