Shawn Swain 
2005 Nissan Titan King Cab 4dr King Cab XE Rwd SB (5.6L 8cyl 5A)
50 series flowmaster
 When I first got this vehicle I was getting 13 Miles a gallon in city and 15 on the highway. After driving the vehicle a month I put a 50 series flowmaster single exhaust on it. When checking mileage to my surprise it went from 13 to 15.5 city and 22 on highway. If you can withstand a little noise it is really worth putting one on. I have already paid for it in savings on gas at $2.50 a gallon. $230.00 flowmaster.