The GOAT. The GTO was resurrected in 2004 with a 5.7L LS1 powering its streamlined 2-door chassis continuing its long lasting American muscle pedigree. In later years that 5.7 got updated to a 6.0L LS2 to join its Trailblazer SS brother opening up the aftermarket for both cars even wider.
Regardless of your power needs CT Performance can point you in the right direction. CT's founder Shane owns two of these himself and knows the ins and outs of the LS platform (obviously) and specifically the mighty GTO.
Customers purchasing any stage in our performance ladder receive a custom built tune for your specific setup - street tested for drivability and verified for power both before and after our modifications.