Apparently, you've been paying attention to the commercials and advertisements. So, why exactly weren't you wearing your seatbelt again? Something tells me you knew about the front plate thing, too...
Save your money. You should be concentrating on getting the car running well, not spending money on more useless shit that nets you a 3% gain at the track.
1) Your car is shifting like shit because the PCM uses your MAF signal to make decisions on pressure and times for each shift. Get the car tuned correctly so your MAF reads properly and that will go away.
2) Your car doesn't show a misfire history or current count because P0300 is disabled. Enable P0300 and you can see the history again.
It's already started...
New intake is installed, I started removing all of the badges, and I made a tint appointment for tomorrow. I'm pondering removing the side moulding right now. Anyone have an opinion on that?