Hey guys I just bought a 2002 7.3 powerstroke and I wanna put stacks on the truck the kit that I'm buying gives me straight pipe from the turbo back is it ok to alimenate the muffler and run straight pipe or will running straight pipe cause me to loose all my back pressure and possibly burn a valve out? I hear of guys running straight pipe on these diesels all the time. And it sounds really good but I'm afraid to do it myself until I get the right advice. Well that's it thanks for all the help

 

Straight pipe won't harm the engine any. If you have to get the vehicle inspected, it may prove to be a problem.

 

I'm running 5" straight pipe out the back. If you can deal with the noise. No problems with smog. Cat not needed for your year.

 

The noise dosant bother me I want it to be load lol but will it sound good or will it kinda sound like a gas v8 with no muffler? And I guess gas and diesel engines are different when it comes to that my uncle john is pretty mechanically inclined he was the one that told me I could burn out a valve because there would be no back pressure.

 

The turbo provides plenty of back pressure. Something you don't have on most gas cars.

The sound isn't anything like a gasser with no muffler. It's really not too much different than an open flow through muffler that comes with many of the aftermarket exhaust systems.

 

This rumor about back pressure (or lack of) and burning valves needs to die too in diesel AND gasoline internetzzzzzzzzz

Who comes up with this garbage?!?!??!

 

The good news is it pre-dates the internet. Burnt valves were a problem for hot rodders more than the regular folk. Hot rodders and racers used to run straight pipes more often. Someone connected a couple of dots that shouldn't be connected.

If you think bad info spreads fast on the internet forums, travel back to a time when most of the country had fewer than a handful of TV channels, internet didn't exist, a larger percentage of the population would work on their own vehicles, and the dirt track and drag strip circuit was bigger because muscle cars were the in thing.

Sometimes it's just easier to say the turbo provides plenty of back pressure so you don't have to go down that whole road.

 

Back Pressure (Reverberation) is necessary in gravity feed carburation systems only and assists with atomization of the fuel delivery across the intake channels. Direct Fuel injection (Sequential) under pressure and is independent delivery.

The issue with Valves stems from an imbalance in cooling causing "coaking / carbon deposits" on the exhaust valve preventing it from closing completely thereby exposing it to increased heat from combustion.

Basically a lack of heat that assists to complete combustion on the Power Stroke and inability to burn all gasses following the exhaust stroke.

 

I'm not quite sure I understand Tom are you saying straight pipes are ok or are you saying that I should have a muffler for the proper back pressure?

 

Your fine straight piping it. I have had a straight pipe since 03 and my truck is a 99 without an issue. I don't care for the stacks as you loose bed space but that is just my own opinion.

 

Straight Pipes are fine. If doing straight pipes, one should really open up the intake as well. (more air the better)

The only complaints I hear is drone in the cab. Some say its worse on the Crew Cabs. Some people install resonators to help try to reduce it.