Ya, added PSI means you can add more fuel. HP comes with it. But on gen3 M90 most start to see KR around 10-11 PSI. (no IC,WI stuff like that) So I think thats were about were the trade off. So at the track with race gas, timming contraol, and a gen3 (even ported) I think should run X pulley for 11-13 PSI than add timming untill KR.
And on the street don't run alot of timming. If you get bad gas, or you IC pump dies and your running a 2.6 20*+......... thats how you chip stock pistons. they don't like KR with timing that hi. And I don't see a resone to drive around with lots of timming, (IC) people that can run 23+ on 93. Your cars fast as is. No hige ass dyno differnce runing a lower 17ish advace. Your just looking for troble w/ the lots of timing.