I played with one of those stub stacks, i put it back on the shelf to collect dust. I think the idea was good but maybe not quite dialed yet "15 years ago..."
This 2" raised R2C insert and the ENTIRE assembly matched the dyno "hat"! It also reduced dry flow on the flowbench almost 20cfm! This is why testing and not just on the dyno, but real testing from flowbench work, to dyno, to G-tech, to butt-dyno, to track is so important. This 2" raised R2C insert will now reside under my own truck's hood. J.Rob