Speedmaster spark plug holes improvement??

PRH said
In the other thread where you said it made you feel better......that’s where I put it....... especially for the milder builds.

My expectation would be that what you did wouldn’t show up on the dyno.
But..... there’s only one way to know for sure.

If you’re worried about flame propagation from the shrouding of the plug...... put some E3’s in it.

I guess I didn't like the looks of it how it came, but again, I know people that just bolt eddies on OOTB with no issues. Probably more of a mental game, but the way I see it, it can't hurt.