lol...

Well here is a basic rundown of OBD with hondas...

all 88-91 hondas are pre-obd, also sometimes called obd0. OBD stands for "on board diagnostics".

92-95 hondas are obd1. Obd1 only has 1 oxygen sensor, and doesn't have as many emmisions limitations, and has many many sources for tunability.

all 96+ vehicles in USA, honda or not honda, are obd2. It was a federal regulation on emisisons. they are more picky when it comes to tuning and don't have as many options. Also they have oxygen sensors after the catylitic converter which throw check engine lights. obd2 hondas also have crankshaft sensors, some have knock sensors, and other emissions crap.

If you have a 98 SI, which is a 98 EX here in America, you have a d16y8, sohc vtec engine which is obviously obd2. To convert to obd1, if you have an obd1 donor engine, you'll need an obd2a to obd1 conversion harness to plug in your ecu, which can be bought off of many sites online for around $80. Get a good one because if one wire it messed up, it'll give you days of headache. Other than that you might need a few very minor wiring mods but it should be striaghtforward.