I used a home made seal actually, and i ordered a new one i have yet to get. So i may remove it before i put the new seal on and have a few rides w/o it again to see if it still seems like the top end isn't that much better w/o it. If it still seems like way more low end torque and not a big benefit on the top i'll install the new seal. But the torque seemed thru the roof when i put my home made seal on there. I mean it really seemed super strong. Oddly it no longer does and i'm not sure if thats because i got used to it or because the adaption eventually screwed me out of it. I'll soon know i suppose. But i'm definately getting better MPG with a seal in place.