Well I've just done mine, 3" Bellmouth front/dump from JJR. Wasn't too bad i suppose, would have been easier if I had someone to help though. Couple of tings that I'm a bit concerned about.
1. Boost definitely sounds louder (i.e. whistling sound) and comes on quicker too, but definitely higher pitch? Is that aright?
2. The O2 sensor couldn't tighten up all the way, it's tight but there is about 2 more turns to go all the way... i.e. the o ring is loose. Badly machined threads from the JJR dump pipe? Is this a problem, as it is tight anyway? I don't think there's any leakage.
3. I only managed to put back the main heat shield with 2 bolts out of 5. Nothing to tighten it too. It's secure. But the rest of the pipe doesnt have any heat shield/wrapping? Should it?
4. Only managed to put on 5 of the 6 bolts back to turbo, one of them just refused to catch. Others are on pretty tightly, will there be leaks?
Cheers.
Nick.