Actually the length of the header primaries and every change after that has as much to do with it as diameter. We learned about all this stuff back when I was in engineering school. I only paid attention in the classes that had application to cars and things that go. LOL! Anyways, you are correct, the thing has to move a larger volume of exhaust then a smaller displacement motor, so it can handle more cam and more exhaust then a smaller motor could. If it feels soft off the bottom, I'll just put some tailpipes out the back and that should help.

We still have a lot of IEDs and some hit and run type stuff, but it is nothing like it was for the first guys who came over. On base its fairly normal.

 

If anyone is interested, I got the longtubes on the truck. If you have the mopar valve covers, save yourself some time and go ahead and take the drivers side cover off. You aren not getting that one in without taking it off. Anyways, the headers look boss on there especially with the black valve covers and I painted the motor chrysler orange when I built it. Well, my brother drove it to town with the open headers and the muffler shop welded up the X into where the Y had been and then put in the two dynomax glasspacks for me. It has true 3 inch duals all the way back and it comes out straight at the back. It sounds good and is actually pretty quiet at 60 mph. But its VERY loud at WOT and when you crank it up and it now pulls to redline really good. It did lose a little off the bottom, but not anything the gears, cubes and stall cant take care of. However, I wouldnt recommend something like this on a 318 or even a 360 with stock heads. I'll try to get some pics up here later. Man its great to be back in the states (the southern states that is!)

 

this isnt necassarily about the exhaust for your truck.

but i saw that you said you didnt wanna live in NC cuz of emissions- well here in NC we JUST passed a law that any car/truck 10 years or older doesnt have to pass the emissions test. so i dunno when your movin back, but if its in a year (07) then itll be legal. just lettin you know.

o yea and sick truck

 

This is what I think off Pacesetters [sm=shootshoot.gif] I got the summit sorty headers, which ended up being Pacesetters. First set the sealing weld looked like a mountain ridge and could not get to seal. Second set ended up having the weld give between the flange and tube. Both leaked from day one and after several months of finding the source of the leaks, I took the f#cking things off, surfaced my old manifolds and haven't tried again.....

 

yea i havnt heard alot of great thigns from pacesetter either... witht hat much hp and pressure coming from the exhaust id keep an eye on them welds like what chopper said...

welcome back Marine!! glad to see you got back safe!!!!!! you trying to get up to Legune?

 

Yeh, I am at Lejeune right now, but I am actually going back to a reserve status soon.... I'm probably going to move near Lumberton, I dont think that is an emission county.

I have heard a lot of stuff on pacesetters too, and so I was understandably concerned about it. However, the LTs really did look good when I got them. I looked them over and they seemed to be well made. The only thing that concerned me is the metal seemed softer then the JBAs I took off. However, after resetting the computer and driving it around last night, I can tell you there is no loss of torque really and the thing really rips to the 6K redline. I was fooling around with some guy and it actually spun most of the way through first gear as I was passing him, it was fishtailing. I am pretty impressed by the setup and its growing on me. Also, the check engine light hasnt came on, it used to stay on because the excessive backpressure was making a low rpm miss.