a little update
changed plugs
new Audi tt dv
new n75
new cts
installed pd160 love it noise wise more responsive too (shame I can't use k & n drop in due to error popping up again)
stock air filter still in and no errors to date
car sounds and goes great but:
I feel sometimes the torque isn't there on the highway its like something is switching a switch and the pull torque isn't there, other times its crazy, I feel when I tap the accelerator back and forth it feels like something is loose Underneath between the gearbox and motor axle, but I get no noises. It feels like I have some slack while tapping accelerator back and forth. Checked the dog bone bolts are on tight no tears in rubber. Clutch pull and hold grips great no slippage.