RE: Mopar M1 intake
I had mine installed last week in my 318, and for the very reason you mentioned: the plenum gasket. I could have just had the gasket replaced, and/or bought an aluminum plenum plate, but it made more sense to me to eliminate a gasket (i.e., potential point of failure) if I could easily do so. I got mine, along with the installation kit, directly from my local MOPAR parts counter. Part #'s are P5007398AB for EGR version, P5007852 for non-EGR, and P5007638 is the installation kit (no gaskets included). I seem to have lost a little low-end torque, but it's only a subtle change. In no way did the switch negatively affect everyday driving, and I still enjoy "gettin' on it" several times a day.