I see this new product at MBRP just wondering where a guy would put it, in place of the muffler or like just in front of it or something???

Looks like a muffler replacement. I saw something similar for on my MR2 board. It basically uses some well placed holes to create a vacume effect and really suck the exhaust out. My guess is its a whole bunch of BS unless you are really running right at the ragged edge. Don't join golfers and fisherman as the most gullible consumers.