Originally Posted by 180SX

no no.. the motor stutter is intake compressor surge.. this is when the turbo is producing too much cfm for the intake valves to handle.. this is actually a very common thing on dsm's.. even with a upgraded intake plenum.. The turbo is outflowing the motor. The reason you are seeing it with the nos is because you are adding crazy amount of cylinder pressure and a lot more turbine spin .. hence more air coming out of turbo. I see this on my dyno every now and then.. esp on the 2g 4g63 motors. Bigger intake valves = good.

Martin
XAT