 Here is just your's and Bretts, both done on Dyno jets(if I'm not mistaken), with similar results in the spool up region. Way to many factors at play though to draw any conclusions about what might be the cause. Your dyno is Red and Green now, Brett's is cyan and purple. Yours at 21 Psi, untuned, with the following mods Wiesco 88mm pistons Eagle rods JWT 400+ cams JUN valve springs Nismo 740cc full balance and blue print Dupree exhaust manifolds JWT Sport700's w/downpipes & test pipes Stillen sidemount intercoolers And Bretts Run at 24psi, mild tunning, and the following mods Engine: Twin pop intake (single maf) Stillen Intercoolers JWT ECU Nismo 740cc injectors 95 fuel rails with machined lower plenum JWT 700 BB turbos Ported exhaust manifolds Koyo radiator Greg Dupree split runner 2.5" downpipes Stainless 2.5" midpipes Stillen 2.5" cat back RVM hard pipes Greddy type R bov's NGK copper plugs, heat range 7 Electronics: Apexi AFC-II HKS EVC 4 limited edition AEM wideband O2 sensor & readout Defi BF boost gauge Defi BF EFT gauge Defi control unit As greg pointed out. It isn't totally fair to compare dyno jet and dyno Pack, but just for fun since you asked. Here are all 3 overlayed, your in red

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