Aaaah, that makes sense.
if i just added some octane booster, that would at least cover the pre-detontation aspect, but i'de still run hotter then i'm suppost to. grrr. Car sounds soo much better with out going through the silcencer though.

*Sniffle* now i'm going to comtemplate taking it out though ....
predontation should only be an issue at sea level right?
(So the K & N engineers ignored all that when desining an intake kit for a specific car (impreza) ? ) I rarely ever go to sea level, well i do go to sac on occasion... hmmf. would you be afriad this is going to kill the motor with in 100K miles ? or even be noticable ?
(thanks for the info again btw lot o smart guys on this forum )