Muffler Replacement

JAFO · July 30, 2002

I want to change the sound of the exhaust on my Sierra (5.3). I don’t want anything too loud; I do want a rumble but nothing too outrageous. I’m interested in hearing the experience of those of you out there that have changed only the muffler. Can’t see spending $300+ for a cat back system for only the sound. I’m interested in you opinion of the sound, what it cost and if you had it to do all over again would you do the same or what would you change.

While on the subject of exhaust… Does anyone know if it’s possible to get an exhaust tip like the one they are putting on the new Sierra Denalis? If so where and how much? I figure if I have to go to GMC it would cost me more then the above muffler.

Thanks in advance for any and all help!

Cyclic · July 30, 2002

Quietest good sounding muffler for me is the Flowmaster 70 series. Part number 53072 is a drop in for the late model trucks, I didn't even have to use a extention pipe to join it.

Flowmaster

TheScaryGuy · July 30, 2002

Can’t see spending $300+ for a cat back system for only the sound

Bout what your going to spend at any muffler shop to have exhaust work done with a decent muffler put on. If not more. Its not what you know, its who ya know. Case in point, my exhaust cost me 40 bucks heh heh. 3inch pipe with a 40 series dual chamber. Might be a bit louder than what your looking for but a 60 series should suit you fine.

Shaners · July 30, 2002

My friend put the 70 series Flowmaster on his stepside. At idle you can hardly tell it's on there except for a low gurgle. Under power it sounds very good (subtle but much throatier than stock). He used his existing pipes, and just swapped out the muffler.

MarkD · July 30, 2002

Shaners,

Have you heard an '02 Dodge 4.7L Ram idle?

There is one at work and it sounds much more noticeable than mine, but not obscene.

gmcjoe · July 30, 2002

The Rams do have a nice rumble out of the box

JAFO - I have the Flowmaster 40 on my 5.3l Sierra. I have a wav file on my webpage, just click on the pic below if you're interested. There is some resonance in the cab around 2K RPM, but a nice rumble outside the truck. I'm happy with it

fennsz · July 30, 2002

i had my stock muffler cut out and put a FloPro Glasspack in it's place. The total bill was $42 and some change. It sounds great. You have a nice deep rumble while on it and it's just a bit louder than stock at cruising highway speeds. Lower rpm cruising you don'e even here it. I would recommend this setup, I have it and 3 of my buddies were quick to copy. You won't be dissapointed.

razor · July 30, 2002

i just had the "Flowmaster forceII"installed on my last week,my is the 50 series(a little louder than the 60 or even the70 series) but still kind of quiet @low Rpm .when i want to hear it i just turn off the CD..even with the windows up :0

Stepside Z · July 31, 2002

I just ordered a Gibson S/S cat back for my truck. I will let you know how it sounds and any performace gains in a couple of weeks.

psychoticide · July 31, 2002

I also went with the Flowmaster 50 series. Not only drastically changed the way the engine sounded, but there was also a noticeable performance gain. Slightly better mpg as well. I spent a little less than $300 for true dual 50's.

Z71IN' · August 2, 2002

I also went with the Flowmaster 50 series. Not only drastically changed the way the engine sounded, but there was also a noticeable performance gain. Slightly better mpg as well. I spent a little less than $300 for true dual 50's.

I may be wrong, but isn't 'True Duals' when you don't have a Y-pipe... I.E. headers/manifolds into two seperate pipes, into two seperate cats, maybe an X-pipe, into two mufflers and out? I'm not saying that you don't have this... I am just trying to clarify! If you do have this exactly how did you run that? Did you just cut off the y-pipe and run the pipes from the cats on back into two mufflers?

Thanks!