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Also wanted to quote this portion...
"The turbochargers developed specially for the engine powering the new BMW M5 stand out with their particularly high level of compressor and turbine efficiency, and deliver maximum charge pressure of 1.5 bar."
Does that mean its running 21psi already or that the turbos have the potential to do so?
The turbos in the S63 for the X5/X6 M run 17.4lbs of boost so there isn't a crazy amount of room left on the table if the literature is correct. Granted 4lbs of boost wouldn't hurt and you would probably gain a decent pressure drop with better intercooler, catless downpipes, freer cat back etc.
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1997 M3 Coupe - BMWCCA I-Prepared #22
2006 M Roadster - 23,000 miles and slowly counting |