440s should top out close to 250hp I believe. The 550s will give you a little more headroom.

 

The low impedance Supra 440s are not square plug.


Source: I run them on my daily driver. They're an oval Denso plug, but with a different slot "key" thingymabobber than the Mazda offerings.

 

Oh, nice ninja delete, you ninja deleting ninja.

 

Yeah, I read your post again and realized that my obvious post was obvious It's actually a thing that carries past the Supra plugs - the low-imp Rx7 injectors also have a different key-slot on the connector than the high-imp injectors do.

 

Straight from the Redundancy School of Redundancy.

 

I have been researching. What I can't find I ask here.