Mark D's chip rev's to 7100, Dinans to 7k.
Mark has a chip for the M42 motors made for 93 octane too

Otherwise his regular is for 91 octane, like Dinans and JC's.
1: Mark D
2: JC
3: Dinan
I know there are some others, but that is who we are talking about.
Check the GB/Vendor area, we started up another group buy with Mark, 8% off his price.