**UPDATE**
Have put about 800 miles on my truck with the pulleys, and between both city, rural, highway miles, I'm consistently getting 1-1.5 more Miles per gallon. Didn't really want to comment that early, could have been conditions, but 800 miles of an extra MPG+ I think speaks for itself.
Very pleased.
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Specs: 2004 4.6L SCAB | Gryphon Programmer 87 Performance | Magnaflow True Dual Exhaust - Rear Cat Delete | S&B CAI | Summit Underdrive Pulleys | Troyer eFans (ordered) | Smittybilt Bullbar | Procomp 6" Driving Lights | UWS Toolbox | Rhino Lining | Chrome Steprails | 2.5" Leveling Kit | 265/70/R17 Goodyear Wrangler AT's
Vids: Magnaflow Startup & Revs - Interior Exhaust Sounds
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