throw together a miltek mate, they are the best on the market IMO
get the R32 zuast for the GTI and a downsizer for the smaller pipe and your sorted.
Milltek said they couldn't help? Is it that simple? Do you know where to get the downsizer from?
What size tips were on your mk5?
Cheers
Ollie
no idea on the size of the ends mate, i ahvent seen a better looking system than the miltek tho
downsizer would just have to be made up to suit the size of your current system. I know a guy who has converted loads of diesels and sml engined petrols to r32 look a likes so its defo doable.
Either buy a cheap std R32 back box and have a go at fitting it, or get the gti r32 system and make it fit cant see it being difficult