You might see 1 lenth in 1000' from my testing....only thing more you are going to get is timing. You do get snappier feel though. Just went through testing it acouple days ago. We were only racing 660. RTX clutched (Boss) no studs, ripsaw track against mine attak with all the goods.....if we raced out of the hole got him about 3 lenths right there and creeped away. Rolling start - just creeped but nothing crazy maybe 1/2 a lenth. So that is the true differents from my mods after clutching, Ramair lid, ck10's and powercommander. 1/2 to a lenth, not worth it to me. Riders were within 20lbs of each other.