Quote:
Originally Posted by Alext
Thanks for the clarification Dr - interesting to note the top end power seems to be maintained on the 1M rather than dropping off sharply on the 35is. Could be a freer-flowing exhaust/mapping and/or the benefit of the 98 octane?
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I think the exhaust is different on the 1M, at least I never heard the "drone" problem with Z4is which is very very common (majority of the cars) with the 1Ms. We owners already started to switch to N55 midpipes or MadDad's to increase flow, high rpm revving and throttle response (in non M or default mode) in our cars. These alternatives are reported to minimize drone problem as well.