Mazda claims 237 HP at the engine. Actual measured HP indicates it's closer to 210 or so. Typically we see 180 HP at the rear wheels. They only have to be within +or- 10% by law.
You will be chasing numbers for the rest of your life if you expect the HP quotes to be accurate. The only important thing is % increase with modification. Stage 1 gives just over 10% increase.
See the dyno plot in this section. BTW, that plot is old, and the newest version is much better. Not necessarily more peak HP, but more HP throughout the rev. range other than the peak. We will be getting a new dyno plot done sometime soon to show this improvement.
Last edited by RX-8 friend; 02-28-2004 at 11:50 AM.