Ok so after spending the last couple days reading alot of posts on this site I just have a few questions

1. What exactly is knock retard ?

2. Where can I get a scan tool and what ones the best ?

3. Can u run a 3.5 pulley with little to no mods (I know for the 3.4 u need alot of mods and its unsafe but one of the performance sites said 3.5 pulley for stock gtp)

4. Where should my knock be when I look for it ?

5. I noticed everyone says colder plugs and i see autolite 104s alot but I look at autozone.com and advanced and they both say autolite 104s are not for the gtp and they dont list them under it ?

sorry for so many I tried answering most of them by readin posts but these are the ones im still tryna figure out...

thanks, Nick