One of the most highly modified Pontiacs at next month’s SEMA Auto Show won’t be an official General Motors offering but the car should serve as a major endorsement for the ailing carmaker and could even boost interest in the tuning scene for one of its top models. The car is a fully customized 2009 Pontiac G8 designed and developed by up-and-coming tuner Neil Tjin.

For those unfamiliar with Neil Tjin’s previous works, the West Coast designer has built a number of high-performance Japanese cars including a R34 Skyline sedan with a RB26DETT GT-R engine as well as a carbon-fiber wrapped 240SX.

Tjin’s latest creation, labeled the G8 CST, is being built together with California’s Unique Fabrication and features a special Webasto twin-vent sunroof. The car’s exterior will be finished in a PPG blue-gray paint scheme and inside there will be diamond-stitched two-tone leather as well as an over-the-top Focal audio system.

Performance modifications include a Vortech supercharger and intercooler, American Racing headers, Corvette Z06 brakes, 20in One Lug wheels wrapped with Dunlop tires, and a set of Eibach springs.

More details are expected to be revealed closer to the car’s SEMA unveiling but you can follow its progress by clicking here.

Pontiac G8