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I've got a K27 on mine and have been running 1.1 bar which is about 16 psi for quite a number of years. Mine is a track car so it spends a fair amount of time at full boost. The K27 has over 66K miles on it. For the first 40K miles it was run at 1.0 bar boost. At 140K miles I changed the jet which upped the boost to 1.1 bar. Head is o-ringed, and I do not run it over 6K rpms even on the track. With 95 octane fuel, it will hold 1.1 bar all the way to 6K.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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