I having been looking into purchasing a new m.a.f sensor but there are a lot of options out there. I bought one from autozone (which was cheap) and i had hesitation. After doing some researching i found that some m.a.f. sensor garantee against hesitation. I see slp offers one that says it hads up to 10 rear wheel h.p. Is this at all possible??? Or is it actually doing a tune for you?