I weighed in at the track yesterday at 1470 (1655 with me). The last outing I was a 1475 (1660 with me) I still weigh the same but I did do two minor changes to my car. 1) changed the muffler to a stinger 2) changed my rear centerlines w/radials to erco with slicks.
I'm thinking that the muffler change must have been the biggest reason for the weight savings, and that maybe erco's and centerlines have a very similar weight. I always thought erco's were supposed to be lighter than anything.