Demon SVT got 200+ FWHP from an internally stock 2.5L But he had done about everything from extra Extrude Honing of UIM, removed LIM butterflies, big t.body, lots of careful port matching, headers, true duals, and lots of time in tuning his Tweecer enhanced EEC (and MORE)...
Unless you are quite capable, it will be hard to reproduce his work but 2 or 3 people have surpassed 190 FWHP with careful bolt ons..and with P&P and 3L valves it should be doable.
