I've had MR Freeze for 6 to 8 months. The only thing I did to alter it was to put a hose clamp on every single line. The only problem I have had with my car is when a vacuum line, etc. comes off and the car goes lean under boost. I have 15 pounds at 5300RPM. I pegged the mass air at 480rwhp. The tuner said if not for that he could have gotten much more. It's okay power for now on Cali gas 91 octane but one day I will get a MAF extender and cams and push it way over 500RWHP. By the way these type of kits are old school and were in use in the 60"s according to the shop I had it done at.