A full 64mm from turbo to exit, or 2.5". Unlike any other L300 turbo diesel pipe on the market, this completely stainless unit is a true turbo back! Replacing the stock downpipe and carefully shaped to offer the most amount of ground clearance. It uses the factory exhaust hangers, has a massive straight through low profile muffler which is actually very good at keeping the noise down. It is flanged into 3 sections for ease of shipping, and as an added treat we will be designing different rear sections including more side dumps, rear exits, and the ability to run a DPF. So if you bought this pipe but later on decided you want to make it a rear exit, we will offer just the rear section so you do not need to replace the whole exhaust. The downpipe turbo flange is for the factory style 3 bolt exhaust housing.This pictured pipe was only tack welded together during design, but now it is finished as the first prototype and we are ready to begin manufacturing now! You can see the pipe pictured next to a normal design to get a real appreciation of the evolution. Comes with all new hardware, metal gaskets, and additional hanger. Please specify which turbo you are running and if you have done the D4BF swap before ordering. As well please inform us of any suspension modifications you have done, as far as lifting or using driveline spacers.