Quote:
Originally Posted by pokeybritches
The ESS tune is spot on, as long as you don't modify beyond OEM U.S. or Euro headers. ESS will not tune for stepped headers, so I had to seek an alternate dyno tuning source, which was expensive. ESS said stepped headers will not work on the Z4M (they do, as both my cars have stepped headers).
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Interesting, I was originally planning on a vt2 with ss v2 stepped, and catless. Are there any numbers for OEM US vs euro headers? and does the ESS account for catless?