definatly not cheap when my brother was looking at this. Internal strengthening is a must, surely there are ways to illiminate heat build up with a TT, would be cheaper too than changing the all the internals for the SC. with the TT bhp improvement is vastly easier to increase than SC. So if heat build up is the only reason for going SC than TT then Id spend time in seeing if there is any heat deflectors on the market that might be worth investing in, rather than gathering the huge list of internals that will need replacing when you go SC route