Boost Logic’s Magnum GTR Exhaust is the largest system on the market. Dual 4” pipes merge into a single precision fit 4.5” pipe which hugs the exhaust tunnel to the rear of the vehicle and optimizes exhaust flow. While this system is only .5” larger, this creates a much larger area for flow with the 4.5” system flowing 26.5% more than a 4” system. This exhaust system is the highest power system on the market for a rear exiting GTR exhaust system. Normal 4” Systems begin to have power restrictions around 1,400whp and above, while our latest system will allow you to make significantly more power with a rear exiting exhaust configuration. This system weighs only 27 lbs, also providing a huge weight reduction over the factory system. Features: Precision TIG Welded, Full Titanium Construction Proper Merge Collectors For High Flow Fully Adjustable Titanium Slash Cut Tips Includes: Dual 4.0″ to Single 4.5” Titanium Mid Pipe 4.5″ Titanium Cat-Back Exhaust Fully Adjustable Titanium Slash Cut Tips Stainless Steel Clamps and Hardware Needed For Install Applications • 2009 and newer Nissan R35 GT-R Fits USDM Models, European and JDM models. Some trimming may be required for install     Here is an example of trimming done to the lower diffuser bracket. Here is an example of trimming done to the lower diffuser itself.