The map is quite different between the 116i and 118i, the 116i's boost level is slightly lower and drops of at higher revs.
There is also a software 130mph limiter on the 116i to give it a 10mph gap to the 118i.
AC's software sets the boost pressure the same on their 116i and 118i boxes and the difference is 200bhp v 204bhp. So it hardly seems the small exhaust section has a massive effect.
A 10mm exhaust diameter difference on a 1.6 turbo charged engine is not going to be a 50bhp difference.
Cheers
Lee
Last edited by logiclee; 05-22-2013 at 12:03 PM..
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