Well i have the ice box and i like it. Felt liek a lot more mid range without havign to downshift as much going through mountains. I did have a problem though. About a 4 to 5 months after i got it i noticed the engine was really loud when i got on it but didn't think too much about it. Well after a 200 mile trip home and 2 hour trip to visit a freind i opened the hood to see the intake hose and the filter completely disconnected. I was mad and scared that my engine was ok. I put a metal collar on it and tightened it really well. It hasn't come loose since. im thinking this was jstu a freak thing cause haven't herd of it happening. I still recomend the ice box. But if you do go with it if the eingine gets loud pop the hood asap.