Originally Posted by rjrutzky
Sounds like your car likes the 8 heat range plug better.
I use 7s on my 207 v7 and don't ever see over .9 on the knock volt (I am still at low boost though). Sounds like you made a good find for your car to me--congrats. Have you done any dyno tuning or just street. I'm scared to push mine with the base timing map until I get on a dyno.
I've done lots of street tuning (only) so far.