straight will be the most free-flowing, and the loudest and get you the most attention (not all from who you want it), curved offers a little noise suppression. I guess i have been asleep at the wheel too long, i haven't heard of chambered... unless that means a muffler
there is no "better"... depends on what you want. I chose chambered because the extra 2whp wasn't worth the noise from a straight-thru setup and I simply wasn't going to spend the loot to buy a mugen twin loop.
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