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Message: <blockquote data-quote="Snorky" data-source="post: 1589319" data-attributes="member: 29157">When I had my on3 billet 6766 bb it started at 3500 and had full boost at 4300. Same P51, stock pi heads. Cms stage 2 turbo cams.Current mhs stage 2 ported PIs. +1mm valves, mhs stage 2 turbo cams P51. Turbonetics billet 7575 bb.  Same basic spool conundrum.  Don't have a. Pi intake to test the theory though. Either A. Intake manifoldB. some horrible leak I haven't found yetC. Somethings wrong with my engineI went through my engine already and I've been chasing leaks for a decade.  Haven't tried an intake swap yet.</blockquote>