Well, i reckon...

From left to right...

Fitted with a highly modded Bugatti EB110 quad turbo engine, 4" exhaust from each GT35 turbo to minimise backpressure and a 5" combined screamer pipe from the single external wastegate (Only 1 needed as car runs in bazai mode with turbos running 3bar and boost is limited more by revs and cam profile than the wastegate)

Supercharged V8 with 1 large exhaust per every 2 cyls.

Ferrari V12, hence the need for 6 exhausts as the bore needed to have less exhausts woulnt give enough ground clearance.

And the last one is just some skinny spikey haired trance loving tosser with more money than sence that just been down powerflow for a ghey exhaust for his 1litre piece of shit.

Or maybe thats all of them