Please note that the main backbox is now supplied in satin / unfinished stainless (rather than polished as pictured) to match the car better, and can easily be refinished with a blending pad. As pictured - stainless steel freeflow exhaust system, made exclusively for us in the UK. After selling over 100 of what is known worldwide as the "UK Exhaust" we have now further improved on the design and the quality of metal used. The system has NO catalytic converter and consists of a dual free-flowing design, rather than the original single pipe. The benefits include - better performance, longer lasting, looks better, and more importantly sounds better! (video below). This is a high quality and bespoke British made product - please note this won't be cosmetically perfect - there will be numerous minor handling marks and scratches on it. Supplied with a satin / unfinished industrial finish on the back box (not as pictured). Also note that in many cases you will need to use a drill to slightly widen the 3 mounting bushes on your car by 0.3mm as the 3 mounting bars on these exhausts are (deliberately) slightly thicker than the stock ones - and probably bent at the wrong angle to match your car..., particularly the top one. Care should be taken during installation to make sure the tailpipes are a suitable distance away from the fascia - too close or touching will result in a warped rear bumper. As with anything on a DeLorean, expect to be doing a lot of wiggling, hammering and bending - no two cars are the same, and because they are hand made, the mounting points on these backboxes have a variance. Comes with the oxygen sensor port in the same place as the original. Use the supplied clamps with silicone on the 2 slip-on parts, the back box/muffler attaches with triangular gaskets and bolts/nuts (supplied). Replacement triangular gaskets are always held in stock. You will also need to purchase (all stocked by us) 6 manifold gaskets, and usually 24 studs, 24 washers, 24 brass nuts, and this is a good time to replace the oxygen sensor, the 3 rubber exhaust mounts, the large heat shield, and at least 1 of the 3 exhaust brackets - click here for the complete kit. After installation you will want to adjusting the fuel mixture - if you haven't already got a mixture adjustment screw bung then you'll want one of these (see below). The simple technique is - turn screw right until the engine dies, then turn screw left until the engine dies, then turn it back to the middle of those 2 points, and insert the bung. You should also re-shim the primary pressure regulator to 5.4bar to get the most out of this system - see the K-Jet shim kit.