| 9:1 compression (now that i found out it is standard i MAY go to 9.5:1) Using a higher compression ratio will lower the amount of boost you can run without detonating at any given octane level. Consequently, it will lower the amount of torque your engine puts out since your effective displacement will have decreased (remember, when you run more boost you are cramming what was a larger volume of fuel/air [at atmospheric pressure] into your cylinders) With race gas it may not be too much of a big deal due to the high octane, but on pump gas you're not going to be able to run too much boost with a 9.5:1 CR as you would with an 8.5:1 or lower CR. Especially since you live out in CA where you have that fake premium (91 octane) gasoline. The upside is that you'll have faster spoolup, but you just won't be able to run as much boost. Using a lower compression ratio will enable you to run more boost, but at the expense of slightly more lag. Hope this helps.
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