Hey , during tear down on my 840 build I noticed that I had bungs in my muzzys front head pipe & rear head pipe. I got my Muzzys in the summer of 08. Merlin's 09 has only one bung were it y's together. My question is that the bungs are 8 or 9 inches from my heads but most air/fuel gauges say 16 inches Can you tune it this way or do they have to be 16 away. Or do they recomend it just for the life of the sensor?? It sure would be nice not having to weld new bungs in..Can any body help me on this??