7psi max is standard so firstly your car has the boost raised with most likely a remap. Any ideas what remap it has?
Fuel pump - may be fine at stock psi and slightly more but when demanding additional loads to deal with the demands of a remap it may not be able to provide consistency. May be even a dicky fuel pump relay.
What are your ignition components like? (HT leads, plugs, distributor and rotar)
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2000 C70 T5 GT Coupe
1998 S70 R / 1995 Toyota Supra Twin Turbo
2007 Mercedes CLS 320 CDI / 2011 Mercedes S350 Bluetec
2007 Suzuki GSXR-1000
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