I have a 01 2500HD with a Flowmaster 70 series catback, I am soooo damn tired of the interior noise , that I am thinking of putting my stock muffler back on. Do you guys think that I will hurt my performance any? I don't know how well the stock muffler flows. I would get a magnaflow or flopro but I just spent $800.00 on Nelson Tune, E-fans, and ASP pulleys, so I am broke now .

 

Save your pennies and get a Corsa cat back when you can. I had a 70 series Flowmaster on my truck before it rusted thru. Corsa is friggin loud when you get on, great sound at idle and whisper quiet at cruise.

 

I just got at FloPro 2503 on my 2500 and I can't notice any rumble at all. It's a quiet as stock. There may be a little burble at 2000 rpm otherwise it's silent, the tires make more noise. I've been told that they gain a little sound after they "season" or break-in. If you want quiet, this is the muffler.

 

Thanks for the info guys, SS Crew how much did you pay for the flopro, if you don't mind me asking.

 

For the muffler, 3" tailpipe (since 2500LDs come with a 2-3/4" tailpipe) and reuse my high dollar Corsa tip, installed: $300.26.
No one around here has any deals on the FloPro big oval mufflers. Have you checked thier site? They also have a dual outlet muffler that will make more rumble. How much rumble, I don't know.

 

Thanks for the info, I think I will put my stock one on for now and save up some $ for the flo pro.

 

I really feel better about not getting the Flowmaster 70 series, I almost had a muffler guy talk me into it. He says he puts them on at least 5 trucks a week with no problems. Glad I stayed away from the FM.

Corsa does make one for the 2500HD, but the system for your truck is about $900 thru Corsa. You might be able to save a couple hundred through Jim Pace Pontiac. They have a website. That's were I got my tip. The Corsas on trucks that I have heard and ridden in are as they say: Loud when you want it, quiet when it needs to be. That's what I wanted, but they don't make it for the 2500LD.

 

Corsa is just too expensive for me at this point. I am going to get my tb port/polished and the flo pro and I will most likely be threw modding my engine, I don't want to go internal on it, think I will save up some cash for some mods to my next ride hopefully a 04 Cobra or 05 GTO.