i just got crx si with a b16 but its on stock ecu and i need to remove the speed limiter and wanna squeeze out some extra power. i'v heard about p28 ecu's but i dont get how they work and i dont know what ecu i currently have i just know its the stock one btw here are my mods:

intake
header
full exhaust
type r cams
type r manifold
spoon vtec controller

try a integra ecu works for me has richer fuel mapping and 7200 redline, its in a 90 crx work great. pm7 is the ecu code check ebay

i order for it to work best, get an ODB1 ecu and have it chipped. then bring it to a tuner to maximize power gains from your mods. they also can remove speed limiter through the chip.