It really depends on the type of riding you will be doing.
I've got a complete Brock's Alien Head setup. It's truly a race exhaust. Great flow-through and with an airbox mod you can cram as large of an amount of air through it as possible (other than adding boosting options). I love it. The only downside I can see for some is the noise. It's not quiet! I keep the baffle in mine all the time (as I don't drag race). I really doubt this setup would pass a noise inspection test. I can promise you it won't pass an emissions test.
No cornering problems with this setup. It's short and tight enough you're dragging pegs before the exhaust.
I've got a complete Brock's Alien Head setup. It's truly a race exhaust. Great flow-through and with an airbox mod you can cram as large of an amount of air through it as possible (other than adding boosting options). I love it. The only downside I can see for some is the noise. It's not quiet! I keep the baffle in mine all the time (as I don't drag race). I really doubt this setup would pass a noise inspection test. I can promise you it won't pass an emissions test.
No cornering problems with this setup. It's short and tight enough you're dragging pegs before the exhaust.