Really descriptive title there "??????" - makes it really easy to search later.
I added to your title for the thread so that people can see if it is something to click on or to search later.
And shorties provide a little better tone to the exhaust note, but don't do anything for performance to speak of.
No need for the swap to the Screamin Demon coil. The stock coil is good, and some have had problems with the demon coil.