I was told by my muffler guy that I would not need 3" exhaust, and that anyone that asked for 3" didn't know what they were talking about. So I ordered a 5"x8"x18" 2.5" magnaflow and 2.5" cutout. I will only be running one pipe btw. So is this too small or should I find a 3". Summit and Jegs are out of the 3" of the same size...

 

3'' exhaust is good for the track but as for everyday driving and use I'd go with 2.5''. I went with 3'' mufflers and 2.5'' tubing. But as far as running one pipe I'm not too sure. I think 3'' would be a good idea in that case but wait and see what everyone else thinks.

 

tell your muffler guy that my truck comes from the factory with 3" pipes, but maybe the general didn't know what he was talking about...

 

For a single exhaust a 3" is about what is needed for a mild N/A setup. Your exhaust guy doesn't know how to make any real power. I run into those dumba**'s all the time. Stock 5.3L exhaust is 2 3/4" and that is for a completely stock truck. Why go smaller?

 

Single exhaust? I wouldn't go with anything smaller then 3 inch. Duals? No smaller then 2 1/2 but thats just me. If I were to run a single exhaust on my 95 it would be a 4 inch pipe mostly because I can and because I hate back pressure.

 

Aight, damn. Anyone know where to get a 5"x8"x18" 3" muffler since summit and jegs are out of stock for the next month?

 

I think that 18" is going to be too quiet for you IMO

I'm running the 3" in, 2.5" dual out with turndowns and I've got a cam, longtubes, and no cats and I think its pretty quiet sounding. You can just about hear my exhaust leaks over the whole exhaust haha (I'm gonna get V-bands soon)

What kind of sound are you wanting? Is he just welding up a muffler in the stock location with stock piping? If he's using stock piping you will need a 3" muffler, otherwise you're just restricting flow even more.

 

Here is one that is in stock, but it is the 14" case and will be louder
http://store.summitracing.com/partde...5&autoview=sku

Heres another one that is 5x8 and is 14"
http://store.summitracing.com/partde...5&autoview=sku

Here is an 18" but is 4x9
http://store.summitracing.com/partde...5&autoview=sku

 

I would run a single 3" if I were you. 2.5" is smaller then factory, especially if he is not capable of making madrel (sp?) bends. Granted I am moving allot more air but I have dual 3" with a X pipe and didnt notice any loss of lowend. Check some of your local shops, allot of shops carry Magnaflow mufflers and I cant imagine 3" being that hard to find. JMO

 

lol of course you're not going to lose any low end with a boosted 6.0...

I'd sure hope not anyways