With Audi killing off new ICE development the 4.2 RS5 8T will most certainly be in line to hold value and become collectable as more EVs invade our roads. Perhaps not the inline 5 since Audi stuck it in the RS3 and thus made the TTRS a little less special, and the 4.0T which is prolific in a ton of newer Audis, I can only think of 3 engines that will stand the test of time and contribute to the collector / enthusiast audience the 4.2 V8 from B8 & 8.5 RS5/RS4, the 3.2 VR6 and the amazing twin turbo 5.2 V10. Sad that Audi are ending ICE, but great for this of us that own cars with these iconic and sometime quirky engines....along with their unique sounds.