arghh, I have one of the early production cars. I know it has had minor problems, but Ofna has sent new parts for every problem for free. I have also read alot on the TTR S3 and it too is haveing minor issues and they are being worked out. All in All I am very pleased with the Jammin, and everytime I have raced it people come to me and comment how planted it looks. Also in regards to the filter, both my Mugen and Jammin do that.