i used a s300 on my b16b with mani,decat,2 3/4 exhaust,filter and fuelin upgrades and saw good bhp/torque gains,smoother power curve,lower vtec change over,higher rev's ,plus it has all the extra data logging/error code reading extras,to get the best from your mods and the ecu you will have to use a good tuner to get the best out of it,prob cost round the £300 mark but well worth it,just for the 20-28 torque,i would recommend CPL racing for the mappin.i have a s300 p28 obd1 to obd2 converter if interested just pm me,ta matt
I would recommend going with the S300 setup instead of S200. Hondata discontinued the S200 for a reason.
Also, the S200 can only be tuned through a Hondata authorized dealer with the Dealer package while the S300 can be tuned by anyone with a wideband and a laptop