Who's running 17+psi

You need 7's after 15psi IMO.

Make sure if you have a gutted plenum, that the top is welded good with nice thick metal. I thought it only happened on Fast and the Furious, but I blew the welds on my intake at 21psi.

NGK 1095'S are one stage colder. I would recommend those as well as lowering the plug gap to around .030 or so. I run mine at .027 and do not have issues with blow out.

7's at .03-.033 gap. Don't kill your gas millage unless you are having issues with blow out.

Excellent. Guess I'll order me a set of 7s. Thanks guys!

I just lol'd really hard

I have 550s. 553cc to be exact high impedance but I have a mustang gt airflow sensor (the "other" ford maf curve in nistune good for 500whp) So that needed k adjustments back up. With both my k is 200.

Great, thanks for that info. I will use 200 for a starting point and I should be able to go from there.

There is a tick box you can check when adjusting injector size that will recalculate K-value on it's own. I would go by that as injectors swing the K-value one way and the MAF has the opposite affect on it. I don't remember which one is which. It is in one of the Nistune Manuals.