I love mine, but it does sound a lot meaner with a testpipe, I recently took the testpipe off because, it doesn't mate well to the stock downpipe.
I paid $440 shipped I think? or $450. one of those two.
what size is the piping for the HKS? I really want 3 inch piping for my exhaust system so I dont have that much back pressure. or is three inches to big?