my OCT milltek cat/exhaust with aquamist rs6 is pretty quick. Pulls hard up to redline in 1st, and 2nd... but now, a new problem.. i hit 82mph-ish in 3rd at WOT, approx 5000 rpm, and the car "sounds" like its still WOT, but is accellerating like not only have I lost both turbos, but 4 cylinders as well... it takes something like 30 seconds to go from 80-90 mph.
Going back to dealership i guess... only thing that's happened.. I was getting a ABS/ETC light, so took it in.. they replaced a "brake sensor," and driving away from the dealership, i noticed this problem... it was constant that day, and is now intermittent.
ideas? no MIL's have been tripped.