I have been using V98 for quite a while, to be honest, not much difference, but maybe because my car is standard.
According to fifth gear, they ran a test on U98, V98 and normal 98(I would say equal to Vortex98 here) with three cars:Clio, GTI and STI.
The result was: for Clio all the feul are same; For GTI, 172BHP on vortex, 174 on U98, 177 on V98; For STI, 235bhp on vortex, 248 on U98, 249 on V98, and 238flpd on vortex, 248 on U98, 258 on V98.
So at least in europe, and on performance cars, Vpower is better.
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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR
Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport
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