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E30M3 Race F10 535 R1150Rt M Coupe
12,225 Posts
Oil consumption unless very egregious wouldn't slow a car down significantly, at least not to the extent you report.
(If that's you in the right seat? Your EPR hasn't changed that much from oil. There's likely something else amiss.)

Will headers help, well yes, but if there's another issue correcting that FIRST will yield better results.

Most are successful with cleaning the rings with the right additives and oil to restore ring function.
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