With your larger pulley you are making the same amount of boost as they are with the smaller one. Compressing air generates heat, and since you are compressing the same amount of air it will make about the same amount of heat, even with the 94/95 blower being ported. Like willwren said, when you start going to pullies that small you are going to hurt yourself more than not, because the blower is going to be trying to make more boost than it is efficient in doing, so it will just make a lot of heat and a little more boost. But that hotter air, along with the extra drag on the engine due to having to spin the blower faster overrides the extra power you are going to get from the additional boost.
For instance, on my dads GTP he can run a 2.6" pulley with 0kr. He can also run a 2.55 & 2.45" pulley with 0kr. However, with the 2.6" pulley the car is faster than it is with the smaller pullies because the blower doesn't make much more boost with the smaller pullies and it makes a lot more heat and requires more power from the engine to turn it that fast because it is out of its efficiency range. And the M90 is a lot more efficient than the M62. You would think that the M90 would make the same heat with the 2.3" pulley as the M62, however it is moving so much more air that it is creating a lot more heat. This is the same reason that the M112 hybrid (M112 rotors in an M90 case) has to have a much larger pulley than the M90 to make the same amount of boost. If you put the same size pulley on it, it will be trying to move so much air that it will just heat it up way too much.
I don't know if that made any sense at all, but thast the best I can do right now to explain it.
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!