I have a question. I put an OS 18 TZ and a real tuned pipe in my RS4 3 a few months ago and the motor has as power as mod motors I have paid $300+ in the past. Here’s the question. How on earth are you guys keeping drive shafts in these things??? Rear center shaft breaks every time I drive it. (unless I baby it and who wants that?). Front center shaft, every other time or one of the rear axels shafts. I have twisted over 20 dog bones/CVD’s in halve. I have now tried some after market (GPM) ““stronger shafts”” with some improvement. The rear center shaft is still iffy.