For the most serious racers. It fits left hand drive S30z. Fully hand made 6-1 stainlesssteel header with a merge collector in the firing order (1-5-3-6-2-4) allowing the exhaust vortex to come out in an uninterrupted spiral. It also gives truely awesome exhaust note. The V-band clamp makes the installation so easy. The primary tubes are 48.6mm (appx 2″), and collector is 80mm (3 1/8″) V-band clamp style. Ideal for our Stage-5 and Stage-4 engines, or hang it on the wall as a piece of automotive art. Square ports only. Made to order. Takes 3 months to make. Comes with a 2″ long accompanying 80mm V-band joint to make a matching custom exhaust with.