I'm pretty sure most people would agree that the D23 is a more powerful engine. Plenty of dynos and track runs to compare. I have the D20 and it doesn't rev to 8K to get equal power. I let it hit 7K at the track recently and actually ran a slower time (because the power starts to drop off after about 6300 or so). These are the facts I have. Are we talking about peak numbers or usable power? I wish I had the 2.3L. ......
05 ZX3: Steeda intake, 67mm TB, custom 2.5 Magnaflow exhaust, Tom's Tune.
New: 04 SVT : K&N panel filter, 3 performance motor mounts, Taylor wires, orp, 67mm TB, Tom's Tune.