One of the more popular modifications performed on Godzilla's platform is the addition of a quality high-flow Y-pipe. With a good Y-pipe and a tune, major gains can be had. COBB Tuning has stepped up to the plate with the release of their 3.5" Stainless Steel Y-pipe which combines larger piping diameter along with smooth bends that allow those turbochargers to run free with more power, more torque, with reduced turbo lag. Additionally, you get that quintessential VQ38 growl with this Y-pipe. 

COBB designed this Y-pipe with high-flow catalytic converters implemented in the design, and new gaskets and hardware will be supplied to make this Y-pipe ready for installation. If you're on the path to "FBO", then this is a great start.