That Intake Manifold will hurt your low end big time and with your mods its just a waste of $$.. I remember you saying you wanted to make the car faster and you keep looking at odds and ends that are high dollar and wont get you squat. You mentioned that the car was tuned and I asked you what management you had and you diddent know. I would take the car to Mastro and have them check your ecu and see whats up. You have a good platform to make the car much faster for little cash. With a 255 pump, ecutek reflash, avcr or esbc from pdx and i bet you would see a world of difference. That package I just listed is right around a grand. 290-315whp range with your turbo back, header, cold air..