with traction, you can get into the 12's with 10-12psi...it's not a big deal....traction is the biggest issue....hitting 12's isn't super hard, but hitting 11's might be on a street setup....but i'm gonna do it....i'm also building my block, because after owning a lot of turbo cars, detonation is inevitable when driven daily in our summer heat/humidity.....the money spent on the extra "insurance" is worth it to me