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Been running 1.1 bars (about 16 psi) with stock injectors and 3 bar fuel pressure regulator for 5 - 6 years, 50K miles, and probably 40 track events. I have a non-stock head gasket, however. No problems.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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