I'm afraid I must agree. after looking at the evidence, they ALL seem to be crap.

 

Amsoil additive:
http://www.amsoil.com/storefront/aob.aspx

i actually tested this on my set up, whether i increased in power or not i dont know, but i was using my haltech and recorded a log of before and after with only 2 degrees advance at full boost/load. i was seeing knock. so i kept everything the same and i used their engine oil for a while. i think its great, but i was curios to see what the car would do.

previous run was at night 3 and 4 gear 14psi = slight knock with 2 degrees advanced for this test

next day same outside temps, same gear run. i added it during the day with half a tank and was driving around so i thought it would get mixed well.

second run i did 3 and 4th and no knock. i did it 5 times hitting 14 psi and no knock. go figure