Join Date: Aug 2010
Location: Sassamansville, Pa
Thanked 196 Times in 157 Posts
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It's your turbo, the '07's have more blades on the turbine wheel, less whistle.
Your bro has either a late '04 with less turbine blades than the '07, or the early '04 which has the '03 motor and less turbine blades than the late '04's.
Get a '03 turbo if you want more whistle.
2004 F350 CC DRW King Ranch
X-3 tunes by DJ'S,QT,GH,ID. Gryphon FICM tunes, ARP studs,Stage 1turbo,ATS coolant recirc lines,Swamp's 48v ficm,coolant filter,AD2,Snow Perf stage II,EGR delete,4" turbo back straight pipe,S&Bintake,Quad "A" pillar autometer gauges,Suncoast Tri Disk Conv.,Billet input shaft,Suncoast superduty rebuild kit,Trans-go shift kit,Mag-Hytec trans pan,CFM+ elbow,ccv mod,15K reese 5er,17" LCD TV/DVD,Cobra 29 Nitewatch CB