I agree with you about a chipped car not being stock. But the SCCA doesn't think it gives you that much of an advantage. But they do get all wrapped around the axle when you change wheel sizes or suspension parts. Even R Compound tires are okay in stock classes as long as they are DOT approved..... Go figure.

There's only 1 DS car that can and does beat me and of all things it's a WRX Subaru with R Compound DOT approved tires. I beat all the other WRXs by at least 2 seconds. But this guy with the R Compound tires beats me by about 1 second. I'm sure if I had those tires I would own the class. .... Oh well... One of these days they will have some for the 19s... I hope!