I have an 06 wrx and was wondering what is the max safest that the stock block and internals can go up to for whp and wtqr. I know the tranny will break way before that, I am getting some PPG gears to take care of that. I am looking to put about 400whp their abouts.(maybe a little more). If I have to upgrade the internals, what will I need to change? Thanks for the help.