Think you mean progressive shock, mainly used on asphalt I think but not saying it won't work as it seems the setups are getting closer. Why are you choosing BD7? If others at your club use them fair enough if not go with the majority or an Xray. (Difficult to break, great spares back up if you do and a good forum to share setups and help others)
Anyway if your just starting out then forget the option parts the kits are all great out of the box only needing a couple of tyre, spring, roll bar and shock oil choices to suit all tracks. Slow is the new fast in TC by that I mean 17.5 is a great place to start, you may think it's slow but if everyone is in that boat then I think it improves your driving, learning how to carry corner speed and not brake!
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