Such a noob question, but what is engine knock exactly? How do I know if I am experiencing it? I have a cobb ap on the way and I am running a weird setup which isn't technically supported by a map. I have a full 3" cat delete exhaust with stock DP, and a K&N cone on the stock maf housing. I plan on running the stage 2 91oct with cobb sf intake. Everyone is saying to log everything and check for knock. I have no idea what knock is....

 

hmm all the info are in here.
http://en.wikipedia.org/wiki/Engine_knocking

 

i still have my grade 11 auto mechanics text book from 10 years ago!

you should really study before you do any modding!