Id stay away from any spring change if you want to stay stock. Your biggest improvements will come from bigger front bar and better tires. Cant beat A6 as optimum tire for C Stock. Anything less will be about a second or two slower. The BFG Rival and New Dirennzia Star Specs are emerging as a couple of best street going AX tires. People in street tire classes in my area are going with Dunlops mostly. Beyond this you will want to make sure your alignment is setup for autox as well. Its most overlooked and one of more important elements of the sport. Make sure you get enough negative camber and toe out to get most from your car. Also dont skip on tire size. you want at least 275 up front.
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Grant
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