Is this H23 factory with the VTEC head? In America the H23 has no VTEC but you can put an H22 head on it. This I've heard is good good horse power and torque but is really unreliable. Due to compression changing when you put the H22 head on. I also thought the Euro Rs had an H22 but possibly I am wrong or differant years had this H23 VTEC, if its a factory engine with VTEC then I wouldnt worry. But due to the aftermarket, you could probably make more power for cheaper with the H22.