I STILL don't think with just a remap, a top end eliminator and basic bolt-on's you're pullin 250. More like 185-190. What kinda dyno was it measured on? I'm sure it wasn't on an Edy Current. If it was on a DynoJet Dyno, those a KNOWN to be VERY optimistic.
The HIGHEST HP I've ever seen on a naturally aspirated 4 stroke inline 4 is around 265-270 with HEAVY internal modifications. Especially in the valve train.
Do you mean a Turbo DODGE Stealth??? If that's what you're referring to, then that's incredibly WRONG! I've built, worked on AND tuned many a Stealth and it's twin brother the Mitsubishi 3000GT / GTO ... No way in HELL will those 6G72 DOHC 6's produce 700HP with just a chip change. The ECU isn't the only thing holding that motor back...They require Larger turbo's (or switch to a single HUGE turbo) in lieu of the Mitsubishi T25 units,larger injectors for extra fuel flow , injection mapping, larger free flowing exhaust, replace the side mount intercoolers with a single front mount and possibly a spray cooling system JUST to get into the low 600's at the wheels... Not to mention the minor port work and head gaskets to get the beast to contain 20 PSI boost.