don't know if this should really be in the tech forum...
but stay stock and save money...then go with either a swap or a turbo kit. that's the best advice anyone could and will give you. spoken from experience, and talking with other 240 owners, spending money on headers/intake/exhaust/ecu/cams...etc. is a waste...when the best you'll be looking at is 230(most I've heard..anyone else?) you can spend the same amount of money, and do either a swap or for a little more, turbo the KA.
seems like most of us aren't happy until we reach that
[email protected] mark....so either a swap or turbo is needed.
everytime you feel slow and are itching to buy headers or intake.....remind yourself of how fast you'll be if you wait.
meanwhile...upgrade handling. swaybars, wheels/tires, spring/shock, etc.
I'm sure I don't speak for everyone...but like I said, myself and many others I've spoken to wish we hadn't of spent any money on NA components.