I am planning on putting a 1" throttle body spacer on my 3.7L as well as removing the stock intake and replacing it with a new FIPK or CAI. I'm not sure which brand to go with and I'm curious if anyone out there may have some history with doing this type of work. I can do the work no problem, however with so many products out there I'd like to get a feel of what performs better, i'm looking for advice and whatever suggestions possible. On a side note, what is the purpose of the resonator box? Also, i've noticed a few people post about the flowmaster 40 series. I put a 40 series si/do dumped about 2 feet before my rear axle and I couldn't be happier with the results. More HP, Torque, slight increase on MPG (1-2.5) and 15% (roughly) lowered engine temp which is great especially in Texas! I apprecite y'alls time and look forward to responses!

 

Tex,
Do you get the high pitch, ricer sound above 3000RPMS with your 40 series. I have the delta not dumped with about 250 miles now. It sounds kinda ricey at high RPM's. Other guys said that is normal for 6's.

 

Well as for Cold air intake.... Just lookin around the K&NFIPK is like 250$ or just check around ebay you can get one for like 50$ or less ... i did the ebay route and it does the same thing that the 250$$$$$ one does just saving myself money and adding more HP... i have a 40 flowmaster sounds great!!