Trying to figure out which exhaust syaytem will provide the best sound and most power.
Harley usually makes some Screamin Eagle slipons that are generally pretty decent especially when you find an online retailer that gives a 15/20% cut What you DON'T want are 'drag pipes' They're definitely loud (but not a nice rumble IMO), but you'll lose all your torque since you need a little backpressure
Why do you even ask all you Harley guys will put straight pipes on no matter what anyone else says.
If you are going to do it right you will also need a high performance air cleaner and a power commander or race tuner to go along with that exhaust if you want more power. Any of the name brand systems are good. Do you want an entire exhaust system or just slip on mufflers? Mufflers about $350 Exhaust about 500 A/C kit about 130 Power commander about 350 SE race tuner about 450 Of course you can get most of this stuff online but you do need someone who knows what they are doing to get it tuned in for you. Go to a shop that has a dyno once this stuff is installed. You can pile all kinds of money into exhaust stuff but without getting it tuned properly you are just wasting your money.