Just took delivery of my LS-3 525HP conversion on my 2007 GXP. Riding on BR Racing coilovers, full polyurethane bushings, custom suspension and tunnel braces, and a slick Tremec T-56 six speed transmission. Drove x-country 2500 to get home to Vancouver...this is one outstanding ride. Cruised three 12 hour days in 100 degree heat without a whimper. Fast? This redefines fast. Handling was the surprise...the suspension mods exceeded my expectations. Dave and Matt know what they're doing. Most fun ya can have on four wheels! Great guys; great service.