The horsepower was originally claimed at 250 then apparently went down to 247 and now they are claiming 238. Mazda is still standing behind the performance numbers though (from R&T). I think with the right driver could get better times since Road and Track doesn't always have the fastest times for a car. I also heard that road and track had slight problems with the last port not opening when their Renesis engine was around the 6500-8000rpms range, which would be like running an Honda without the V-tec kicking in.