OFP51

Contemplating dropping out my muffler and welding (prob more like clamping until I'm sure I like it) a straight pipe. Curious if the lack of back pressure might affect performance (good or bad). I did something similar on an old 91 back when I was in high school and ended up with a lot of carbon build up on my exhaust valves later when. I pulled the head off (after like 3 years of running it this way)

RajunKajun59

Go get a 2-1/2" turn down from you automotive store of choice with a a 24" inch extension pipe, 2-1/2" as well undo the stock muffler after the res and plug that extension in. It will give you a good idea of the sound. Don't leave it hanging to long though might stress the res flange to much, tie it off to the frame with a coat hanger.

You can get a few sound clips of my delete on YouTube just search my name.

OFP51

Actually, I did check your YouTube vids before I posted this 😜. I like the sound, was mainly wondering if it had any adverse effects outside of sound.

4.6Intruder

Backpressure is a myth and is frowned upon on this forum. There is whole thread on this and am going to stop at that. There is no performance loss with deleting your muffler and there is no performance gains. The stock muffler already has a straight through design.

OFP51

I'm not entirely sold on the "back pressure myth" as my older truck began to backfire eventually. Led me to put a muffler back on which made it run considerably better (idle was noticeably better and consistent). Only noticed the carbon build up on the valves a short time later when putting a new head gasket on.

I do see where it wouldn't matter as much on this truck as the muffler is a straight flow thru design like you mentioned. Just wanted to double check before doing it.

RajunKajun59

Seat of the pants never noticed a difference with and with out a tune.

cmbezln

absolutely no difference.

RajunKajun59

You just start calculating smiles per mile because your mpgs take a hit when you love the sound.

nugezilla

I removed my muffler a while back and put a turn down right behind the resonator. It was fun for a bit and I enjoyed it easing around town. But as soon as I hit highway speeds I thought I was going to die. Might have been better with a tailpipe out the back, but so much of the sound seemed to echo around underneath the cab that it droned unbearably. And once I hit a consistent low RPM in high gear it made it sound like I had a bad leak.

Coolsmt6

I have my muffler deleted. Haven't noticed any performance issues. Love the sound though.