Values of the BMW M3 CSL remain very strong, around £30k for low mileage example in Silver Grey metallic paint. There is the possibility for a petrolhead to buy a decent standard E46 M3 and enhance it to perform and look like a CSL for a lot less money.
What adds to the attraction is you will have the choice to start your build based on a manual gearbox M3, rather than the SMG transmission that was fitted to all 1,400 CSLs.
For more information read my article.