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Message: <blockquote data-quote="Jules" data-source="post: 92235" data-attributes="member: 88">C1 2.3 has a higher compression ratio, different ECU and possibly a different cam too. Also the head was reworked by Alpina. Not sure if a tubular header was there but the exhaust system is different.C2 2.7 is similar but has a Motoronic ECU, tubular headers, even higher compression ratio, 268 degree cam, reworked head with larger inlet valve, exhaust system. Uses a diesel crank and also has a lower factory restricted redline...Not much known about the rarer C2 2.5 but expect the same with the C1 except basis of engine was a Motronic 2.5.U wanna build one ah?</blockquote>