Absolutely! I think a lot of stock 5.4s will be happier with the 2.3 TVS than the Gen 3. Here's a screen shot of a dyno on VMP's stock 2012 GT500. In this configuration, they have the 160mm TB, a JLT 123mm, 13-14 injectors and fuel pump boosters. These two pulls are with a 2.8" and 2.6" upper pullies. Note that at 5,000 rpm, you're already at 18psi with the 2.8" pulley and 21 psi at the end of the pull. Granted long tubes might drop these a bit, but a 3" pulley is probably more practical on pump gas.
Notice how boost in the dyno graph (graph on bottom of the page) is not liner, but progressive (i.e. increases with rpm). This is the same thing you see with stock engines on pump gas with 3 liter and larger blowers. Sure, they make max boost at the peak and boast high peak horsepower numbers, but I can promise you, you're making a lot less power than a 2.3 at the lower and mid-range levels. You can see it's reflected in the torque numbers. Here is a dyno chart from a front page article on this website when the Gen II first made it's debut. The green lines are 93 pump gas. Granted this is on top of 5.8, so we have 25 more cubic inches to feed and you can see boost starting to drop off in the higher rpm range. This run is also with a much smaller 67mm VMP twin throttle body. To some extent, the IIR probably took care of some of that drop in boost, but I can't find a comparable dyno chart. Likewise a larger throttle body would have improved the peak numbers. But compare the horsepower generated as some of the lower rpm ranges and with the one to the Gen 3. I like to look at average horsepower over a few different rpm ranges.
If you go look at some of BiminiLXs dyno pulls with his built 5.8, you'd see an even quicker drop in boost with his 2.3. He loses boost over the entire pull. My point is if your blower is not making a relatively level amount of boost throughout the pull, you're outside of the efficiency range of the blower. That's why you see that Gen 2R spanking some of the bigger blower contenders. On the other hand, I've heard some with bigger blowers contend the car is more manageable with less torque.
Now before what I posted is taken out of context, if you look at Bad Company's dyno with his 4 liter blower, you have an engine that is matched to the supercharger. Big cams and ported heads and intake can make use of the higher airflow and do it within the efficiency range of the blower.
Just food for thought, and yes, I do tend to over analyze things.
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