dont bother with the 3 series volvo for drifting.. yeah they are small but not worth it. the 240 on the other hand is a rally car and can be modded to such specs. and a rally car just needs more power to be a good drifter. easy to mod. easy to get well over 300hp on them.
you can get 500hp out...
RSI- they are pretty good too. if your only looking for a sub 400hp from the b52, then do that. otherwise if your like me and bulding a 600hp+ brick, hit up www.turbobricks.com and you will find the right path.