you're running hot because you don't have a by-pass and are running high boost for the 1.5. Water/Meth injection is your only logical way to cut down latent heat soak,and high discharge temps. Go on ebay,and look for either snow performance,or Aquamist.....prices are around $350. Inlet restriction causes friction,which affects discharge temps....you shouldn't go any smaller than 3 1/2"s,Mac CAI's are this size. AFM's are 4",at this point,there is no restriction. Plastic vs metal has been throw around for years......I ran both,and never saw a difference in temps. As far as the injectors go, non-discus injectors don't like to operate at high static flow pressures.....for example, 19's,fmu,and 11psi=75-90psi at the rails. Pintle injectors tend to heat up,and LOCK up at these levels,and they become very sloppy....not to mention bad gas milage. 42's are overkill for your setup right now,but you'll never need to upgrade them latter when you add heads,or upgrade compressors. Your tuner can make them work without breakin a sweat. :thumb: