This is the full exhaust system for the Nissan GTR R35 by Tommy Kaira-Rowen. Product includes the Premium 01TR Heat Blue Titan + Racing Front Pipe. The center pipe is 89.1mm and the main pipe is 60.5mm. The weight is 7.6KG lighter than the stock exhaust at 10.2KG for the center and rear piece. If interested, please contact us at Bulletproof Automotive for more information regarding pricing, fitment, shipping costs, as well as installation recommendations.