If so, try and buy an entire car if the price is right. I picked up a whole car for $2600. There will be many parts you can sell then to help get some of the cost back. You do not need to swap the wiring harness. The TT ECU will work with the N/A wiring harness but you will need a boost controller. You will need the TT fuel pump and fuel pump controller. Do as many engine upgrades as financially possible, this way you don't have to go back and do them later. I suggest rebuilding the entire engine. I am putting in eagle rods, new pistons, rings, bearings,3 angle valve job, new waterpump and all that other good stuff so there are no concerns about putting a tired engine in and then having to re-pull it to have it re-built.