Exhaust: The stock exhausts (except that ugly 3rd generation red bull can) are all exceptional. They're loud when they need to be and perform well. A very interesting thing about the stock is that when you cover the exhaust (even with your hand), the motorcycle will shut down. This doesn't happen with aftermarket. If I really wanted to, I could look into why it's like that... Anyway, to swap out just the exhaust, unbolt some near the footpeg and where it meets the header. Put in an aftermarket (around $1000) and bolt in the new in same places. If your looking for a full exhaust system($1500+ easily), you'll have to go as far as removing the fairings in order to get in. Always more inexpensive to buy used, cuts the price more than half. On a side not, try starting the bike without headers and you'll see flames. Ride the bike without an exhaust and the bike will sound like redline at low RPM. So, do they make a difference? Just an exhaust will give you minimal gain, or possibly loss. With a full exhaust system, small gains are guaranteed. The gains can only be guaranteed under certain conditions though...you need a fuel management system...
Fuel management system: PC3 (or the newest: PCV) This system only works for fuel injected versions. Carb based bikes use dynojets, similar idea, but you have to get down and dirty with the bike. This is essentially a computer that is plugged in, easy. Remove passenger seat, unplug two sets of plugs and plug them into the Power Commander 3 in the correct spots and your set with installation. The only thing that remains is to tell it what to do with the Air/ Fuel ratio. Power Commander has done a great job with uploading several settings for many common exhausts and air filters. Connect the PC3 to a computer with USB and transfer settings via program.
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