My srt has hit 100k,and for the past few months the car can only muster 12.9@108 or a 13.1@107 ,I use to bust low 12s @113-115.I ordered new o2 sensors an intake manifold gaskets as a start also I had 4 degrees of timing pulled for nitrous.G ot to get my fuel trims checked I think the sl55 pump it too much for a code 3 pulley