Obviously I'm interested in this. I also agree with Nando we need to make sure we do this right. After a very quick look around the internet here are some ratios.
E46 M3: 15.4:1
E46 M3 CSL/CS/ZCP: 14.5:1
Z4 M Roadster 13.7:1
Z4 M Coupe:12.8:1
E36 (96+ M3): 15.6:1
E36 M3 (95): 17.6:1
Z3: 13.9:1
E46 ZHP: 13.7:1
E46 M3: 15.4:1
E46 M3 CSL/CS/ZCP: 14.5:1
Z4 M Roadster 13.7:1
Z4 M Coupe:12.8:1
E36 (96+ M3): 15.6:1
E36 M3 (95): 17.6:1
Z3: 13.9:1
E46 ZHP: 13.7:1
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