Just got one of HSP's S300 installation kits in to install on my 2002 LB7 to help with some future turbo testing. Absolutely amazed by the craftsmanship and fabrication skills from Joe and Dave. While the out of the box S366 works well for most applications, I'm hoping to show that for a little extra money making changes to the turbine wheel and compressor wheel sizes can make substantial improvements in towing and street performance depending on fueling and end goals...