Leaderboard

Mine is 5" and exits in front of the back tire, so I don't even go over the axle. When it was straight piped, it would kill your head when it hit that droning RPM which is around 1800, anywhere else and it was fine, but with a trailer....I think I watched my windshield crack more... It was absolutely unbearable. I put a semi truck muffler on it and that killed the drone but it comes back with a heavy enough load, but even then the drone is fine. I don't know if straight piping and going over the axle so it wasn't exiting so close to the cab would fix it or not. I put a 1/4" piece of 1 1/2" x 1 1/2" angle iron about 3' long down it when it was straight and droning to all hell, I didn't notice any difference at all.

Most will run a resonator with a muffler to lessen drone and some will run 2 mufflers. The further forward you can mount the muffler the more the drone will be reduced. Extended cabs are more prone to drone.

I would just about bet that it is an injector issue...sounds like one is not completely sealing back shut. this will cause a very..small drip over-nite right down on the piston and when you start the engine the next morning all that excess fuel is on top of that piston and will cause smoke and rough idle until all of it is burnt off...& most of the time will not be noticable if at all driving after warm.... Have the injectors pop tested by a diesel shop..OK tell them what you are looking for that is " a drip overnite" tell him to pump up each injector twice, once to verfiy the pop-pressure and a second time to pump up to just right before the pop-off and hold it there for a few seconds.." if it drips theres your problem" Hope this will help Richie