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Originally Posted by amg280
I thought the Euro spec 5.6 m117 was different from the us 5.6 m117? Wasnt there alot more to the mix than just different headers/exhaust, such as compression and emissions BS? That would be quite nice to get that power from just exhaust....but sounds too good to be true.
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Cams, compression, and the exhaust. 20-30rwhp sounds reasonable considering how much of a cork the US exhaust is currently.
I don't think the extra point in compression makes that much difference.
Cams, sure. They help on the high RPM area.