It might be the 4G33 or 2JZ GTE of McLaren ?In terms of the OP worried about putting downpipes on his 720, it doesn't matter what automobile manufacture it is. You mod your car with downpipes and a tune (have to get a tune if you put downpipes on), and the motor blows, you are responsible and warranty is voided end of story! I think its funny how people are always saying specifically Mclaren won't warranty the cars if there's a problem after they have put downpipes on and tuned them. Well duhhh haha. If you do those same mods to a Ferrari, Lambo, Porsche, shoot even a Kia (if people do those mods to Kia's lol) and the motor blows, the manufacturer isn't going to cover the motor under warranty haha. Now the good news is, I have not heard of any 720 motors having issues whatsoever with a downpipes and tune. Doesn't mean it can't happen, but it appears these motors are pretty bulletproof.