Somewhat dissappointed in my dyno results when adding these two parts. 478rwhp 349rwtq. My AA exhaust w/o a pulley was 480rwhp 349rwtq. I didnt dyno again when I removed the exhaust so I cant say the actualy gain from the pulley and exhaust. I was expecting mufflers+pulley to make more power then just the AA exhaust. I am happy with the sound though. The dinan exhaust is a good combo with the headers. This was on a dynojet so a pulley gain should have been measured correct?