Is this they type of K&N you will be testing?

Not sure, i will know sunday when i pick the throttle body up , did yours come from azsm?

Yes.

I have one. Just 2 days away USPS Flat Rate Priority. Let me know.

Yes that is what he will be testing. Vortech made it I believe.

That is how I remember it. Vortech made them either blank or with their logo and there were a couple other companies (ASM and Teague come to mind) that they made them for that sold them with their own company logos. I am anxious to see the comparison results.

Yea mine says Tyler Crockett on it.

Smitty, I don't see what size injectors and what type of fuel rail you are using for this testing. If different from stock, do you think it is contributing to the strong results?

Also curious to know if the tune has to change when swapping throttle bodies.

When I built this 502 I took the twin rails and 80 pound injectors off the intake i ran on the 540 and put the stock injectors I belief flow 42 pounds and stock rail back on the intake. I made over 600 hp at one point with the stock injectors at 75 psi on a procharged motor. Im currenttly tuning with fuel pressure at 50 psi which makes injectors flow slightly higher than their rated for. As i did my test yesterday i watched afrs, at one point it looked like afrs might have changed with airflamr arrestor install so i tested w more and less fuel in the tune but lost even more hp.

IF i permenetly swap to one or the other throttle bodys i will have to tweak on iac and accelerator enrichment/tps and do some steady state part throttle tuning but being throttle is wide open during a pull as l9ng as afrs are same your good, again, i did add and subtract fuel on some other pulls to see if it liked it but was happy where it was at. When i bolt a stock throttle body on will probably be a different story