from 4400 RPMs to 4600. But I agree that the broader torque curve after that would be well worth that small differnce and recommend them as well. The problem is where will he quit? Next thing you know he'll have two RB swaps Zs in his garage.
m a g l i t o parts are FINALLY here - engine is going back together NOW sig photo by me effects by ZXRider(SoCal)