Usually it’s done by those who want the best performance out of their car. It weighs less and generally nets better numbers than dual on single turbo apps. Less bends means less restriction which means more power, which is exactly why most of the faster Supras are running turn downs right now and other cars run dumps out of the hood. Since hood exits and turn downs aren’t ideal for the street, the single exhaust is the next best thing. You’re hung up on this “incomplete” theory when in my first post I literally stated “hopefully someone comes out with a diffuser”. No one is arguing with you wether it looks complete or not... my statement was that in general single exits look better, of course we don’t think it looks ideal with an empty muffler hole. Oh, and My Te37 don’t have center caps at all LOL Hopefully someone on the forums *cough cough* Titan does a dyno pull with dual and single and overlays them.