On the GTR improving the exhaust system is the easiest and most inexpensive way to increase horsepower and torque.  Our midpipe maximizes exhaust flow and is a direct replacement which does not require tuning.   Expect 15-20-whp gain.
 

Made from high quality 304 stainless steel with chrome steel flanges.
100 Cell metallic cat
Pipe diameter: 76mm x 2, 89mm x 1
2 Flex tube similar to stock midpipe.
TIG welding comes with gasket and mounting bolts.