did you use a real boost gauge or just the lego blocks on the dash board alot of times they dont go full boost and can have a vac/boost leak to the map sensor or if it is like my case somehow after 232,000 miles my sc wasnt putting full boost anymore would go about 2 bars off from full and sometime hit full on a cold day so i replaced it with a p&p one and it works great now hits full boost at half throttle with the new 3.35 pulley