My mufler just rotted off right at the inlet. Just looking for input should I replace the muffler (and if so should it be a high performance) or should I just go straight pipe. Currently im getting approx 19mpg and I dont want to loose any mileage

 

you won't loose mileage either way you go, depends on the sound you want

 

I would get you a Donaldson Muffler or Flo-Pro muffler, they are almost same size as stock with a richer tone and better quality. If you've had a muffler on your truck and you liked it that way I wouldn't straight it out unless you want it to be loud.

 

Mine is straight piped and it is pretty loud under hard throttle. I get better MPG based on the fact that I use loudness as way of staying out of the throttle!

 

Straight pipe it!!

 

... or a Nelson which are pretty much te same as Donaldson, I'm happy with my 40" Nelson, pics in my gallery.

 

Straight pipe is loud...

 

5" straight pipe sounds good......

 

I would think it would be easy to walk into a muffler shop and get a used muffler just liek what came on your truck.
I don't get it, why do they sell delete pipes? Why would you pay nearly $100 (cat and muffler pipes) for some pipe? When A mufflershop would charge you 3/4 of that to do it and you don't have to lay in your driveway for 3 hours....

 

I couldnt agree more with Sam. When I did mine, the cheapest I could find a piece of 4" pipe was like $10 a foot and they would only sell it as a 10 foot length. I had a exhaust shop do it with welded flanges and hangers for $75... seems the better route to me.

 

Yep, mine cost about the same.

 

Mine cost me about $85 by the time I bought 10' of pipe and the clamps. Straight pipe sounds great, as long as your windows are up and the radio is on you can barely tell it's there, unless your really stepping on it. Only way i'd say don't straight pipe is if you tow a lot of heavy loads, because towing it is LOUD. As far as going to a muffler shop, no way i'm letting any joe blow around my truck with a welder I'd rather pay the same as do it myself and make sure it's done RIGHT, for $75 including the pipe, they ain't going to spend much time on it.

 

I would not put a stock muffler on...too heavy and restrictive.

The above mentions are good...

Hushpower has some nice lookin' mufflers made for diesels...they are expensive, though.

Straight pipe it if you don't mind it being loud under hard throttle or towing.

Some of the performance mufflers are not much different than a straight pipe, though.

 

Drone is perfect but not ignorant. And you can hear a little more cowbell, I mean turbo.

It's a truck, it shouldn't sound like a moped with a bad lifter.

The Federal rule for exaust systems only relates to emmisions. This means that if you have or had a cat, a muffler shop can only work on pipe after the location of the original cat. There is no FEDERAL law that deals with the muffler. Money talks, if you want a straight 6 inch after the cat, then a shop should do that for you. Do watcha like. Local sound ordinances deal with the noise issue.


The whole backpressure thing is total BS!!! The turbo is basically a lever. If you press on one side, it will transmit that pressure to the other side. Apply backpressure and you need additional pressure to achieve the same result at the other end.
So if you want 30 psi of boost, would it be easier with no backpressure, or do you want more backpressure?
If you want to believe the magic turbo backpressure wizardry then you would also need more restriction in the exaust piping.

 

I am running the Aero 4040 and its pretty quiet. O thought it would be louder. I had it straight piped when i had the tow twins and it was loud under throttle but a weird sound. Wonder if it will sound different with the R-700 straight piped. I want a nice throaty sound and louder when WOT. What a good muffler the achieve that. No drone when at idle with the aero. What a good throaty muffler.