Originally Posted by zujowro768

I'm upgrading my tb from stock to a 74mm tb. A trusted friend in our xf clan gave me part #a1121410125. So I ordered one off eBay and came in today and I search thru the xf forums to find the part #a1131410125 being recommended for the upgrade. Is there a difference between these two parts? And since we are on the subject I'm assuming I need to get an oring for the 74mm tb and maf housing? I don't usually work on upgrades to engines much other than k&n filters so Im just needing to know what I need to do in order to do this correctly and professionally. Thank you in advance for your input