I will be doing this same conversion, hopefully soon. and was understand you need a custom downpipe, the qpeng one etc. i was just wondering if anyone has any measurements, diagrams, even just photos of this downpipe so i can make up my own one?
With regards to the silicone pipes i saw a review of some in pvw (september issue i think) and results surprised me. There was a pretty big improvement for all they are, doubt i cant remember what brand it was rite now though.