SKING.Was the SPEEDO re-calibrated.The 17s and the 20s are different HEIGHTS by almost 2 inches.You need to check BOTH trucks with a GPS.Plus drivers always make a difference etc. I noticed NO difference with a muffler change in performance or mileage.

Yes speedo was done, it was a standard tire size flash. As far as driving I drove my wife's truck 5000 miles before I gave it to her and I still drive it now when we take trips. We use the same gas station and the same oil, mine just does better than my wife's in the city.

You need just one more rubber hanger, that's all, got mine at a muffler shop. However, I changed the grey bumpers to chrome and with rear duals and installed AFE's Mach Force 3" stainless. These are ready fit for 09 Rams with dual exhaust bumpers only, very well made and medium tone but expensive. If you're looking for best bang for buck with the bumper you have, a muffler kit of your choice and one extra hanger is all you need. It's the muffler with single in and duals out, and two rear pipes of your choice. 2 1/2's are cheaper than 3's and it's a very simple one hr remove and replace with an extra hand at your side.

From the Mopar Performance Catalog:

P5155280 Cat Back Exhaust System, Dual Rear Exit, 5" Rectangular Chrome Tips, 2009 Ram 5.7L (With Bumper Cut-Outs), 6'/8' Bed, 4WD

About a grand for this kit. I'm sure you can get it cheaper custom built.

Cost of muffler of choice (single in dual out) + about $75 for a second pipe and maybe 100 for labor + hangers.

Pretty easy to get it all done for $250-300 depending on muffler and/or pipe tips.