I had the opportunity to pick up a good used M1 intake here locally off craigslist late last year. I passed on it, as the owner of the M1 intake stated that he lost a fair bit of low end throttle response with the M1 intake over the stock kegger intake manifold. I decided to perform the kegger mod and install a new plenum gasket, aluminum plate, bolts and washers. Fixing your plenum gasket on your existing intake should cure your pinging issue and help your fuel mileage, too..
Last edited by AtomicDog; 06-13-2013 at 04:51 PM.