Quote:
Originally Posted by dzz
MHD Stage 2+ needs upgraded charge pipe (stage 1 requirement), IC upgrade and higher throughput downpipe (stage 2+ requirement). If you get quality parts there will be no issues. Charge pipe and IC are usually not cause of any problems, some downpipes may throw an error code or check engine light. I have AR hi-flow downpipe and there are no error codes and no issues. I should be able to pass emissions.
I thought that MHD alone is great, but my car was really transformed after I've installed XHP trans tune.
Turbo and fuel pump upgrades will get you to about 550hp on N55, maybe even more, I've seen people getting over 600hp with turbo, fuel pump upgrade and custom tune. At that point, the question is, should you save the money and invest in used M3/M4/M5 and get much more power from the get go?
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Did you have any issues running MHD with the xph tune together?