Purchased a 01 996 TT could find some answers using the search function, hoping some veterans could jump in and help

For the 01 TT, which Ipod Adaptor is out there that I can purchase.

Is there a FAQ site for the TT that reviews exhaust, intake, ecu, etc

Anything I should look out for other than the 2nd gear pop-out issue?

Any "must dos"?

Thanks in advance for your assistance.