I got an answer on the 12 V forum. I was directed to look inside the 4 bolt flange. Lo and behold, In big deep casting a #12. So I moded the WG actuator at work today and put it on when I got home. (had an HX on the shelf for a while now) Joy!!!!! It now has a different ex note. Deeper and very Airy. Lots of whistle at idle. I only had time for a short test drive but my first impresion is better smoke control at hard acceleration. And I hit 40 PSI on a good quick pull in 3rd. Woohoo. Oo. I didn't even get to warm it up. I'll see better tomorrow. Thanks all.