AMS Performance Nissan R35 GTR 4.1L VR38 Stage 4 Long Block (ALP.07.04.0504-1) MAP Sensor so the ECU was seeing

so the ECU was seeing too great a positive boost in the MAP readings between gear changes and assuming the stock valve wasn’t functioning correctly

Optional Silencer:

What's the difference between SMF and DMF

(1) 15 foot length of -6AN hose

and a massive 360° SuperNano-Web dry air filter

AMS Performance Nissan R35 GTR 4.1L VR38 Stage 4 Long Block (ALP.07.04.0504-1) MAP Sensor so the ECU was seeingThe AMS Performance 4. 1L VR38 Stage 4 Long Block is a top tier solution for high horsepower Nissan GTR builds. This fully assembled stroker engine is precision engineered using advanced in house equipment and strategically strengthened to handle the immense power of OMEGA and ALPHA performance packages. Assembled in a state of the art clean room, AMS applies its extensive race winning experience to create the most advanced and reliable engine program