0171 and 0174 codes HELP!

[sic2001]

I've been getting detonation for a long time now and to make a long story short Ive changed Plugs (Denso),fuel pump (racetronix),04 z06 heads p&p,mild cam and Ive cleaned the MAF with maf cleaner.
I cant even dyno the car it detonates so bad the guy cant get a decent pull on the motor. Im soooo fed up with this and hope someone has a quick and inexpensive fix. I have a 01 A4 with 100,00 miles.

Any help fellas would be GREAT!

[blue02Z]

well, looks like your running lean. did you upgrade your fuel injectors? also, what about your o2 sensors. are they good and working correctly, do you have cats?

[sic2001]

The beast is LOOSE!! I saw on a thread that a vacume leak can lean out the engine so I started with the PVC system where I had added a do- -it- yourself catch can mod with an air compressor filter. It had slid over and had a hole rubbed through the back by the pulley where I couldnt see it till I took it off.
So after all this it is running like a bat out of hell. Its like a whole new car its that drastic of difference. Im going to dyno it next week and then its all about just driving and enjoying....till the next mod. (maybe racing seats

[blue02Z]

great! yeah vacuum leaks will do that due to the fact its unmetered air and will def. lean it out. good luck and put up your #s