Point Matt was trying to get across I think was this...
The GT1/GT2 Cams don't have THAT much lift...actually comparable to a VS in those terms. They also have a close lobe separation for a 3800 cam...which for N/A cars...is great since they don't have much to begin with and keeps them in the band...but for a boosted 3800, torque is a plentiful thing, hence why the XP has nearly stock LSA numbers...as the bigger the LSA, the wider the powerband is.
Hence the reason why people with the NIC cam run such small pullies...the LSA is super low and it bleeds boost of quite quickly, so you need to run more to begin with to help keep up with it.
FWIW, I ran the XP for over 40k...and it was a great cam...ran low 13's on just a 3.4"...compared to an N/A Cam though...it's meh at best...its like comparing apples to oranges...if you want to compare cams...go at it like this...
1.95 Rollers vs. VS
S1X vs. XP
IS3 vs. XPZ
TEP vs. IS4
