1) Yes
2) About +10 HP in the upper RPM band especially (per SVE). This is in the setting of Extrude Hone SVT head/intake manifold work. Gain with non-ported, non-SVT Duratec heads has not been determind to my knowledge.
3) No other cams avail just yet though a few people seem to be working on this
4) Worth is subjective....but IMO not worth it as a single mod due to high installation costs. As part of a 3L buildup or even a 2.5L buildup with ported heads..yes, unless even "better" cams become available (better is also subjective here, read cams that move the powerband even higher in the rev range). And, if somebody blows the motor and is just replacing it and a cheap set of SVT cams/heads are available from the classifieds/EBAY/etc...I say go for it.
5) will work for all year 2.5s (some 3L will not use SVT cams)
6) I do not think anyone has used just SVT cams on a non SVT 2.5. I think 1-2 have transplanted SVT heads to 2.5L, and several use SVT cams on 3L buildups.
