I'd like to install a 4" exhaust. I am looking for something thats free flowing with a deep tone but not to loud. Would I be better off with a 5" system? Which brand would you suggest. Thanks.

 

check out the dtr store 4" is fine

 

ive got 5" . windows up and on the fuel, if im on the phone, whoever im talking to assumes im standing at a train station.

 

That's with a straight pipe! So says your signature.
'Progrower' - If you want "not too loud" don't let anyone talk you into straight pipe. (they will try!) 4" sound better than stock.... 5" sounds better than 4".
Downside to 5" is more expensive and trickier to install due to clearances get a bit tight. No free flow advantage to a 5" over a 4" (some will say it actually reduces HP, but I don't buy it.)

MBRP, In DTR Company Store, is great quality with nice fit at a good price.... and helps keep this site free.
http://store.dieseltruckresource.com/mb19docualtu.html

Good Luck!

RJ

 

MBRP, good tone and easy install. DTR Store of course.