. . . I run no muffler! I go pipe after cat all the way to the back bumper!(in this vehicle that is). I put the better 4jet injectors on a while back, and they changed the sound of my truck to a dull hum, ( It is through better spray pattern, and thus better atomizing of the fuel -- making a better air-fuel mix requiring less fuel to do the same job -- resulting in less noise -- better economy -- maybe? I think so) and the idle is so much smoother then before...the noise is minor at it worst. It sounds a lot less than a flow master muffler system. I live on an AFB...the law is pretty strict in the military...I drive it daily...zero complaints. Most folk can not believe it has no muffler. Go ahead and say I lie...I reap the reward of a long lasting tank of gas!! I am not asking you to do what I do...just that if you can use something I post...and it helps...then It was worth it to me to spend the time to write it all here.
Lucky7auto injector on ebay will sell you the improved(I got mine from these guys, saved money, and over all happy with the result...I had no idea I would have such a positive side effect -- like less noise! I was looking for more MPG, but I changed them because I had one injector go bad...i change things like this in sets, not just one...if my wallet lets me that is)(I think they from a different newer year and model vehicle & refurbished) I think from a 3.8 liter v6 car but I am not sure where they come from...these guys recycle, flow match, and resell them...I paid $100 for 6 including a small s/h price...my average MPG is a solid 18 city I can get 20 if I try real hard, and keep my foot out of it! I do not use any sort of additives to help my MPG figures, and my truck is a POCrap!! It still has a few mechanical needs...i am a cheap ******* so I just tell it like it is...like me or not...that is YOUR problem...I get about 32 highway...imagine when I get the skinnier tires: 215/80R15, and lower it 2 inches, and get that alignment...it will be so good on gas...it might be worth it to get'er painted!!