Does anybody offer a money back guarantee?

 

Not really.
It's like buying an exhaust.
Normally people return them for fitment issues, not for not enough gains than advertised.
I'll let you guys know soon...

 

I just had to give my kid back his stock intake for his 2004 Mustang GT. His custom cold air intake will void his warrenty. Nevertheless, after his once over at the dealership we will be doing the change over again. We all need the extra HORSE'S under the hood!!!