JCviggen

Crap, I'm sorry man. In this game you have to take the (frequent) lows with the (rare) highs I guess. There's not many guarantees when you push things far outside the usual envelope.

A good tune and boost control. 17-18psi limit works well for 300+ whp, get one with a decent size turbine and you're set.

No need to drive like a granny, just don't load it at low revs (or for too long) and use plenty of engine braking.

I think actual break-in time is very short IRL. We beat on Florian's new engine after around 100 miles and it ran extremely strong even hardly used any oil on track (less than my own that had a longer breakin but the same components)
300 miles is considerable...if you can get to 500 and do an oil change I'd be totally happy revving it out and beating on it.

Friggin' awesome H.

Just wanted to add Carbotech are the shit. I'd jump on them if I needed them.