Hello, I have a 2008 Scion xB Manual Trans.  I am not a tech guy and not sure what is possible and what is not.  I will list out what I have installed and what I want then you tell me if I am dreaming or these items could be reality.  If you are around L.A. area and 110% sure you can do this, email me.  I want absolutely professional job.

What I have installed.

1) TRD Quick Shifter
2) TRD Performance Shock
3) TRD Lowering Kit
4) TRD Performance Clutch
5) TRD Sport Muffler
6) TRD Rear Sway Bar
7) TRD Strut Tie Bar
8) TRD Torque Biasing Differential (will be installed in 4 weeks)
9) Fujita Cold Air Intake

What I Want to add

1) 6 Speed Manual Trans that will fit 100%. New Toyota Trans only.
2) Keyless Entry and Start Engine Button (Not remote starter).  What I mean is enter and start the car with key in your pocket.
3) TRD Supercharger (I know this is no problem which i can get from my local dealer.)
4) To have 240~260HP at wheel and yet legal and pass emission test.

Let me know if you or you know some professional who has a shop can perform what I want.  I will only let professional touch my car.  

Are those the Toaster looking ones or the pitbull faced ones?

I doubt you'll find a 6 speed that'll be 100% spot on so, don't follow that idea.

The supercharger I guess is like you said no problem

on the 240-260hp issue, I'd think you'd go over the efficiency of the force induction system (supercharger) specially on the 260hp since it only could achieve I think 60% efficiency as is, and to overboost it would require even more fuel meaning more emissions. Though I think if you'd add another CAT to your exhaust system you'll get away with it... Although the TRD sport muffler is just that a muffler so look for a CAT-BACK.

They did a Project Scion TC on this magazine and they aquired 230hp why not look into that? They drive it everyday and its on Cali...