I like this.
But srsly , if threads are going to be locked because of pre-existing related threads, then more should be closed and locked more often.
You can scroll through the first 2-3 pages of the stagea forum and lock the suspension, exhaust, brake etc threads because they're already stickied or have an active thread.
The differences between the M's and C's can be significant, and personally I wouldnt mind seeing a separate threads.