Im running a ported manifold, harvey uppipe that i was told by as perf that it would suit upto a 18g.turbo is vf48 and 2.5 system, no cats. hit 1 bar just under 3000rpm and full boost of 1.5bar at 3200. did get some fluttery noises but was the air filter sucking its self flat lol. v4 sti engine.