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You don't need heavy mods to upgrade your drivetrain components. You'll feel a big difference in your ability to launch and the transfer of power between gears when you shift after installing a lighter flywheel and stiffer clutch.
That is awfully expensive. I got the ACT HDSS and 9 lb Prolite flywheel for $600 shipped. I love my ACT stuff. If you can find your application for around $600, I would definitely do it.