[rblong]

My existing side pipes are not from Lonestar. They were custom made by someone prior to me buying car, have 2 inch primarys to 4 inch OD side pipes. They have no baffles or mufflers at all. The only restriction I can see is they have 3 inch turn downs approximately 6 inches long. I run stock cast heads, aluminum dominator intake and Demon 750 CFM carb, MSD ignition (limited to 5800), high capacity wires, one step up from factory cam etc. My test did indicate I need to jet the carb up a little since I ran a little lean in a couple of places. Looking at stock specs on engine the 428CJ were rated for 335 BHP/440 lbs torque at crank. Without doing a crank HP test the test shop was estimating my efficiency may be 25-35%. Using 30% that would give me 400 HP/540 lb torque at crank. I know this is a guess, but that is where I thought I was probably doing pretty well with my current set up. I have read original figures were under rated when published. I would love if someone out there had some good experience with 428CJ and could tell me what are some good set up. I enjoy the heck out of it as it is since it is still a lot of HP for the weight and will get loose on me in a instant through three gears. I want to keep it streetable, but enough horsepower is never enough!!! Thanks for everyone's input - as a Cobra/Ford newbie it is appreciated.