I have 2015 a6 with 3.15s and 727 kit i don't drive it much but i am not impressed i took it to the track on street tires have to leave at idle and ease into it to get off the line best pass 12.04@118 i am waiting on the update
I run the 325 30 19 with 3.15 love the around driving highway, road course, drag strip i got a good deal on a 3.55 and 3.73 irs to try out after talk to so guys at the track that have these gear they suggest i stay with my 3.15 because i do everything it's hard to say what gear it really comes...
I went with the roush for the warranty also i don't want to worry about motor and trans problem or having to tune i have friends who tune there cars and i have seen tunes take out a motor
I have the stage 2 and it has fouled the plugs 2 Times and Ford installed it and they don't know why so I took to hpp motorsport to check it out and found out it is running rich and only made 570 rwhp so I called roush and they where real nice they said they are working on the the issue and...