LOL, I think VIR is well known enough...
Use whatever tires you have on there now only do 2-3 laps at a time. Spending less then $130 a tire for road racing is just a waste of money.
So at barely more then stock boost, you're assuming that you need all that stuff to make power? LMAO.
I have probably less then half the number of power adding mods to my car, easily run 15psi and make more power.
Just because your setup sucks for whatever reason, doesn't mean everyone else's...
Other way around. Although there may be another knock somehow way on the rich side of the scale, but it would look more like a diesel truck accelerating up a hill then a car.
Only thing I can think of without seeing it in person is just that you are hearing something else and calling it spark knock... in which case I'll let someone else spray random guesses at you until you fix it. :)
Spark knock... preignition?
Like I said, if all else is well... clearly you have much bigger problems then just whether or not you should run a Lexus AFM.
Start by checking error codes.
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