looking at waking up my 99 4.0 with a better flowing exhaust. I dont want to dump 500 into a bolt on system but would like a nice sounding muffler on it. Any opionions. I had a magnaflow on my old one and it wasnt bad sounding and the guy at the muffler shop mentioned a glass pack but dont want to loose to much back pressure or the gas mileage will drop.

 

Flowmaster super 40......


Inexpensive & Loud (nice sounding loud)


Nuff said

 

i have super 40 series, with straight duals out the back w/ tips. it sound great. It's got a nice low rumble to it, I love it. And it's not at all annoying. I got mine done at place where they do custom exhaust by me, two christian guys own the shop, they're very religious, and do GREAT work.

 

I have a couple of shops that I use. I just dont want a ricey fart can sound and I havent heard any 4.0's with exhaust for reference. One guy I use says flows or glasspacks other one says dynomax or some other brand he carries( he has flows too but didnt mention them).

 

flowmaster 40 series is the way to go

 

 

I had a muffler shop fab up a custom exhaust for my truck recently for $320 with a Gibson muffler. I had a Gibson on my last truck and liked how it sounded but wanted to have duals exiting in front of the rear tire instead of behind, and I didn’t want to remove my spare tire. I figured Gibson had selected the odd 2.5” inlet and dual 1.75” outlets on all their exhaust kits for a reason so I had the shop order their superflow muffler #758216 that had the same dimensions. The shop used 2” pipe on the exits, I guess it’s what they had or it was just easier to do. Anyhow it sounds good without being too loud, I guess you may think it sounds ricy at WOT when its pushing a lot of air, but at idle and while driving sounds deep without being too loud when I'm running on the highway. sorry no sound clip as of yet. Ive got a picture if I can ever figure out how to load it.

 

looks good. betcha its super loud inside the cab.

 

well I ended up with a flo-pro. I didnt realize I had a dual inlet single out on mine so it made it a little more difficult to find something. It sounds alot like the flowmaster with out the cabin noise.

 

50 series not to loud but gets the job done

 

you can try a straight pipe. I have one and love it. It only cost me $45 installed so if you don't like it, it's not like you wasted a ton of money. I have a sound clip and pics of my pipe in both of my sig links below.