Quote:
Originally Posted by nasdaq100
I have no explanation about the performance. I didn't feel it either, just my VBOX show some better results with the plugs connected. I have tried many many times to make sure and the result was always the same. I end up to let them plugged because I drive most of the time in sport so the differences are not that noticeable expect in 4th gear and up when the valves remains closed. I did 900 km on a highway with the valves opened and an Advil was necessary
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Well that's not good. Not that I need 100% of the performance on the the street but I don't think I can live with a mod that impacts performance. It will bother me, but it does sound so much better. I wonder how all these aftermarket exhausts without valves, are going to impact the car?