The 4" pipe could be attached after the 3in pipe goes over the axle so fitment would not be a problem. I think asking for a 4in dual exhaust is unreasonable because of the clearence but the tail pipe idea would work and dual 4in stainless pipes would look awesome. Other ideas: - 2 piece valvecovers, lid would be "O" ring sealed and could be easily popped off to check/adjust valvetrain. - Oil pan/valvecover/intake/timing cover with modern "O" ring seal instead of the old technology sealing we have now. TA Performance answered all issues relating to the block/heads and roller cam retension, what a great company. Mike
