I went by MTI to get my truck tune tweaked for the addition of the Flo-Pro HD muffler. Previous numbers were 298 hp and 318 lb/ft for the intake work, stock muffler and tune in similar weather conditions. Today's results are 305 hp and 345 lb/ft. An increase of 7 hp and 27 lb/ft. I was expecting about 10 each, so I'm quite surprised with the torque increase.

I would like to throw in that the MTI folks really treated me good. I will be doing business in the future with them.

 

Got dynographs?

 

which muffler are you using the single 3" exit or the dual 2 1/2" Got any pics to show?? where did you get it at also, anything mail order??

 

Great info. I'd like to see graphs from that as well. Did you add the flo-pro as a stock replacement muffler reusing the stock pipes?

 

I would post up graphs, but alas, I have no scanner. I did see the torque increase in the 3k-4k rpm range.

I installed the dual in single out as a replacement for the stock one that was on the truck. The muffler shop had to add a slight bend/elbow on the discharge side to tie into the tailpipe.

After taking it to the track a couple of times it is really starting to season into a nice sounding muffler. It is very quiet on the highway, a little noisy at street speeds and much louder than stock at wot.

 

Cool to hear. I have been torturing myself trying to decide between the 2503 and 2504 because flo-pro said that the 2504 flows a lot more. I think that I am going to go the 2503 though after seeing your gains with it.

Aaron

 

Anyone care to comment on how the flo-pro is compared to these RV type flowmaster models? Part # 527504 is a dual 2 3/4" I/ dual 2 1/2" out, and #530503 is a dual I/ single 3" out... the later is part of the 2500HD exhaust catback kit they sell for a 6.0 or 8.1....???? I'm thinking its really similar.... ANyone have pics of their installed flo-pro setup?

 

http://www.flopro.com/FP2500oval.htm


Not the best pics but lets see how the look.

 

My experience with the large Flowmaster mufflers has been that they are louder and resonate in the cab. The resonance doesn't bother some people, but I couldn't take it.

 

Hey Gonzo6.0,

Where would I go to get the flo-pro muffler p/n#2503? (IE: websites, local retail stores) Flo-pro website is down with the dealer page.

Thanks,