1st power stroke
Post Fiend
Joined: Apr 2007
Posts: 7,241
Likes: 1
From: Powder Springs, East TN
Several things, just counting the engine they do not have an intercooler (early 99s did), smaller single shot(correct?) injectors, smaller HPOP, Smaller turbo, different air intakes, different transmissions.
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
You're hearing the older injectors. You can change out yours and get that same sound (or better!!) and get a nice bump in power. But it's a pricey endeavor, and lost of other mods need done first... 
Posting Guru
Joined: Mar 2008
Posts: 1,104
Likes: 5
From: West Tx
I think you need a computer re program to switch don't you? The single shots sound better in my opinion... and make more power as said above... maybe i should switch to single shots to hide the loud cackle haha. Don't the older trucks have a mechanical fuel pump that isn't capable of as high of fuel pressures? I think the largest sound difference comes from split shot injectors and single shots.
