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In the ad for GT4 in Car magazine, the Vertigo is included and again is said "having 897 HP".
https://www.gtplanet.net/forum/showthread.php?t=55614
Meanwhile I found the official Gillet Vertigo website up again, and that says only 385 HP for the Vertigo engine in racing lay-out.
http://www.gilletvertigo.com/frb/racing.htm
I've posted on a Belgian race car forum to get information about a Vertigo with 897 HP. I'll keep you informed, but don't expect too much : the superVertigo in GT4 is probably a phantasy car.
https://www.gtplanet.net/forum/showthread.php?t=55614
Meanwhile I found the official Gillet Vertigo website up again, and that says only 385 HP for the Vertigo engine in racing lay-out.
http://www.gilletvertigo.com/frb/racing.htm
I've posted on a Belgian race car forum to get information about a Vertigo with 897 HP. I'll keep you informed, but don't expect too much : the superVertigo in GT4 is probably a phantasy car.