definitly no air leaks, not thinking its tired either, cant even turn the engine over with my finger from under the chassis, the HSN is about 3-1/4 turns out (factory setting is 3-1/2 out) the LSN is about 4-1/4 out (factory is 5 out) it holds a tune well. I guess its gonna be ok since it sounds good and has good power, and enough smoke, but only time will tell, I havent run my C6BBII L2G past its break in, I guess when I do i will compare the temps. I do think the temps are a little high though, maybe I could richen it up a bit, I am only running in my backyard, between track time on very short grass (actually none now, in the spots tha I run it LOL) maybe that has something to do with it??? I just hate to tune to a temp.