[Stocker]

As far as I know, all Corvette ramhorns are 2.5", but so are some others.... and as long as you get 2.5", who cares if they are actually from a Corvette? Others will chime in with more complete info....

You don't need a heat riser. I live in colder country than you and get along fine without it. When I had one on the truck -- and with daily short trips to work -- it helped rust out the exhaust on one side only.