Not bad. A good VXR with nothing more than an exhaust can see up to 260hp (depending on the dyno) so that's about even with the MPS. IIRC then the Nurburgring Edition was rated at 256 with the Remus (which is the same as the MPS
).
Although tbh I find VXR's very inconsistent. For example my mate just bought a standard Arctic Astra which can fairly give my Stage 1 GTI a run, and yet another guy I know with a standard Arctic (same age of car) just gets left behind. Obviously there's a bit of driver skill involved but there's a clear power discrepancy between the two Arctic's.
Think they're great cars though. Unfortunately a bit common IMO but great looking and sound pretty
too. Prefer the standard exhaust sound now as almost every VXR I see has a Remus.