Originally Posted by Gas_Up_Lets_Go

No, a different exhaust will pretty much give you less weight (so easier to pick up!) and some will give you more lower end torque (MTC single can for instance) but there is no requirement for fuel modifications to support a new can. And there is no requirements for a new can to support fuel/airbox mods.

The airbox/fuel mods will give you more noticeable improvements over a can.

Of course, most performance upgrades will give little amounts of improvement, add them all together and you have a very different bike. For example, Keithblade has a standard bike, I have DNA S1 & S2, PC-V, O2 Tuner and MTC Single Can. I'm much heavier than Keith too, yet my bike can out pace Keiths' quite noticeably.