The particular ported blower that we purchased has a bigger intake (hence the ported) that is smoothed out to make the airflow smoother (hence the polished), and the outlet is the same way, ported to make bigger, and polished to make flow smoother. I don't remember what else they do on the inside of the blower, but whatever that is is what makes it cooler (a lot cooler). The fact that the outlet is TWICE as big as the stock outlet is what makes it worth it to me, and the fact that the inlet is bigger allowing for a bigger TB, allowing for much more flow, and less work to make more boost, and since the outlet is ported to TWICE the original size there is less work to be done to get the air out, meaning less heat making the same boost, so the ported blower is doing its job. Obviously the gain is not as much as an Intercooler or other forms of cooling of the same type, but there is a gain. Like I said, the gain is 20-30 degrees cooler temps. An intercooler is 100+ degrees (some say up to 180 degrees). The Intercooler is 1200 whereas the blower is 550. So the intercooler is twice the price and does 3+ times the cooling. Which is a better deal, the IC, but the ported blower is not useless, and still helps, and gives the ability to run a little more boost, or a little more timing, and can help to lower KR.
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!