Okay first off don't start commenting and saying stacks on a gas truck is gay or any other negative comments. its my truck I do what I want, I'll build it to my expectations. But besides all that I want to put a stack or 2 on my truck and I was wondering if there is special stacks for a gas truck or if you can just use deisel ones. And will they help with gas milage and will it hurt the engine if I do. Thanks

Also what would be the best set up for stacks on a 92 f150 5.0 engine

 

Just never caught on.

 

What kind of sound are you going for? The bigger the stack the more they beller.

I would think that they may be detrimental to performance especially if they are big 'ole diesel stacks. To big on the pipe and it screws up the exhaust pulses and slows the flow. That's why the Lil' Red Express had small diameter pipes.

 

Look into sidepipes.

 

I was kinda thinking about doing a 2.25" pipe inside of a 5" and then about 3/4 or more the way up I'd stop the smaller pipe and weld up some steel or something that connects the smaller pipe and the big pipe inside and I want it to be as load as it can be but I don't want to effect the performance or mpg if anything I would like to increase the mpg and performance

 

You're NOT going to gain any mpg or performance the ONLY thing you will gain is noise

 

In theory the back of the cab is a good place for the exhaust to exit for economy and performance. It's a natural low pressure area. But actually doing it in a way that benefits is difficult to the point of being pointless.


For example if a fairing like this is used and flat exhaust outlets placed pointed back like where these backup lights are, that MIGHT work.

 

When I was a teenager two of my friends ran stacks on their old chevy trucks. They loved the sound (I didn't) but the droning in the cab was ferocious! At certain RPMs we couldn't even talk it was so loud. Just something to keep in mind. Maybe modern mufflers would prevent it?

 

They are going to take up a decent amount of bed space for not much gain at all.

If you use your truck bed at all I wouldn't put them on. But each mans truck is his own so do whatever makes you happy

 

Get some headers, they'll help you be louder. Then put on whatever size stacks you like. Run straight pipe from the headers up into the stacks and stop just short of the end of the stack. Then stand on the go pedal... see if that's loud enough for you.

Reason you want to run exhaust pipe inside the stack is that if you're exhaust is too big you'll lose power. Before somebody comes on here and says because you need backpressure, I'll say backpressure is NEVER a good thing! What you want is velocity, keeping the hot exhaust gasses moving at a decent speed thru the pipe. When you only have a certain amount of flow, then it will move at a faster velocity thru a smaller pipe than it will a bigger one. You can also undersize your pipe and choke out the engine, that's why you need to size your exhaust pipe to what your engine needs.

 

If i were to go it to my truck i would to side pipes at first but if you are stuck on stacks i would set them in the front corners of the box right behind the cab with them slanted toward the tailgate. It would be less noise for you but still sound good outside of the cab ( chrome )

post pics when youre done!!!

 

They are for looks and serve no purpose. Just put the on one(s) that look the best to you.

 

It's a pickup. Not Optimus ****ing Prime.

 

Well said Bob G.!

 

Maybe he's going for the ironhide look