I thought all S4s came with TPMS as standard, apologies, it's not. They wanted £75 for it!
What are you doing to your bluetooth?
Can I suggest a mod for next week... I have my handbrake set to release when I put my foot on the accelerator, regardless of whether my seat belt is on or not. Also, if I press the button to release the handbrake, it turns off, regardless of whether my foot is on the brake. They've both come in really handy for me, e.g. when i jump put the car to move the OHs Passat out the way, I jump out, move the Passat, then can jump in and reverse into my space - without putting my seatbelt back on etc.
There's also ambient lighting, lap timer, oil temp and timed ventilation which are good things to add.