HP 340 Manifolds to a 2 1/2 exhaust sys. is the hot ticket.Have them Jet hot coated and never have the issues I have had.I have TTIs and and will never buy them again.They still dont fit on the rt steering tie rod and the drivers side frame rail.Also the manual steering is barely cleared.The 340 engine is on stock mounts and installed correctly. headers are not worth it........They now make aftermarket HP manifolds,but they are kinda spendy
