This is a twin turbo kit that we did from SDP on a 2007 chevy lbz. This truck has a 68mm, 4094 avnt turbo and a S475 along with some 45 over nozzles from big dipper. We also installed a PPE over flow tank. With some help from EFI live tuning, the truck spools up and makes tons of power. We should see lower egt numbers and better mpg wile towing. If your looking for twins or just want us to take a look at your truck give us a call.