Just had the FloPro 2503 muffler installed on my truck. And there's almost no difference from stock. Maybe a little burbble at start-up and at 1800 to 2000 rpm, otherwise it's damn quiet. Performancewise, I haven't noticed any difference. I'm just a little disappointed there isn't a little more rumble. Oh, well, I'm done with the mods for the truck, now I can dump more money into the boat!

 

swap out the cats like i did. it's kinda loud.

 

Let it "season" a little. Mine has gotten louder over time. It is still a "quiet" muffler compared to most. I could barely feel a sotp increase, but the dyno showed 8 rwhp and 28 rwtq.

 

I can't yank the cats out here in sunny So Cal due to emissions testing. Plus from what I've read, the factory cats are pretty high flow to begin with.

 

i still have cats, but they are free flowing dynatechs. $150 each. yikes!!!

 

Yeah, but you're running a blower, I'm pretty much box stock. I don't think the costs justify the gains for me.

 

Any other performance muffler would drone like hell.dont know if you can handle that.My recommendation would be to have a set of high flow cats flanged at both ends and you can inter change them yourself.Or flange the OE's.I have dynomax bullet mufflers I swap out with my HD cats.I do the bullets when i want LOUD.

 

Seems like a lot of work to make noise that's annoying.

I just was a little disappointed the muffler doesn't make a little growl when I get on it. But oh well, I let it "season" or break-in. Either way I'm done putting money into the truck, it is what it is. I don't have the time nor the funds to make it a "hot rod". I'd love to have a kick *** fast truck, but to do that I've got drop cubic dollars into it. Maybe next time I'll just get a Duramax and tweek the computer. The HP/$ ratio is a lot better. I've got a boat to dump money into and that seems to eat it up real quick.