Yeah, I'm running the standard exhaust with the twin CAT setup. Only real option is custom at the moment which I'll be doing next year. Low down torque is excellent especially compared to my Golf with 110lbft more at 3k and 70lbft more at 3.5k. However after 4.5k the torque and power drop off which I'm sure is down to the exhaust. The peak figures are still only 1bhp and 4lbft less than my Golf on the same rollers though!