Today I installed my Sprint Booster. The unit actually reduced the throttle by wire lag completely in all my drive modes. My ECO and NORMAL drive modes feel like my stock SPORT mode on the Sprint Booster RACE mode settings, actually they may be a bit more responsive than the stock SPORT mode. SPORT mode feels more like a RACE mode now with the Sprint booster set to RACE mode. The car is scary fast when using Sprint Booster Race mode while in the car's SPORT mode. Hell, NORMAL mode surprised me at first with the SPRINT BOOSTER set to RACE mode.
I actually now understand why Hyundai puts the gradual delay in the electronic throttle system, because the 5.0 engine is a real 420 hp beast when fully unleashed which could be very dangerous if the throttle was set this sensitive all the time. Gas mileage also take big hit in the wrong direction as well with Sprint Booster set to RACE mode. The Sprint Booster takes the leash off the engine intial output. Well worth the price for anyone that wants to make their 5.0 quicker without modifying the engine.
I also like that I can turn the Sprint Booster on and off with a simple press of a button.
Here is the Sprint Booster part number and box contents.
The installation is simple, just unplug the throttle connector and then plug the Sprint Booster inline between the gas pedal and throttle connector.
The Sprint Booster controller mounted. The controller has two modes-Sport(Green LED color) and Race(Red LED color) with 9 levels of settings. I just use level 9 on the RACE mode.