He did have it ported..2 years ago now..
BTW, why do you recommend K&N's? Not enough dirt get in for ya w/foam? LOL
A outerwears is mandatory with a K&N.
If drag racing or TT racing I can see using one.
I see your from MI. I suppose you go to Silver Lake?

 

Yes i spend alot of time at silver lake and west mi sand dragway, the dunes ice and asphalt are the only place a stroker banshee can be fully used.

 

The poping Sounds like a timing thing to me with the stroker. My shee would also do it if I forgot to turn the gas on and it started to run out of gas in the carbs.

Still havent heard anything from a plug test. Have u done one yet?