Got the 4.10's in today, finally. Its pretty damn good but its been raining so I havent had a chance to give it a shot. I thought it would be a lot better, so if any of you are on the verge of the 4.10 or 4.30 buy, Id say go 4.30 if you want a real kick in the ass. Anyways, whats the break in period for these suckers?