I ran the stock one on a 2013 X1 35i with the Dinan stage 2 tune for about 2.5 years before it finally gave and split. This time around I've decided I don't want to be somewhere and have it split on me again because it's a weak link in the chain and I will be running the car with the MPPK (after it's broken in) and something on top of that as well added on later. So went ahead and ordered the ER charge pipe this morning.
