How about offering performance packages? Not everyone who modifies their cars is on a forum so some people may not be sure what the best parts are for them.
You could have say a track performance pack and a fast road performance pack.
Track pack being Coilovers, 2 piece discs, track pads, braided lines, fluids, arbs etc.
Fast road performance pack could be MD spacer, eibach springs, grooved discs, ds2500/yellowstuff pads and so on.
Just a thought, might be complete rubbish!