Ernie, I STRONGLY suggest sticking with Pro-M. For every one person that doesn't have a problem with their C&L, you will find 4 that do. I believe it is due to the fact that our EEC uses the MAF to determine load which is used in just about every table within the EEC. Both pro-m and C&L vary the output voltage to the EEC to trick it into thinking there is less air coming in than there really is. The EEC shortens the pulsewidth up then thinking it doesn't need to supply that much fuel, but since you have a larger injector in there, more fuel per pulsewidth is delivered. The trick is to get this right, and I like how Pro-M does it with electronics rather than tricking the airflow past the wires with a sampling tube. For years C&L didn't make a MAF for the 94-95 cars, and it was due to all the problems they had with their meter on our cars. They are VERY susceptible to things that change the airflow such as CAI, etc. My dad has the C&L 76mm setup on his 91GT and we COULD NOT tune the car with a CAI on it. We put the factory airbox back on and finally we could make consistent dyno runs with repeatable results.