here is the image of my smog result, this is the 3rd try, i finally passed. can anyone give me an idea of how to lower HC emissions? these are out of the question:
MAP sensor
O2 sensor
Catalytic converter. i've replaced all that. its all stock, has aftermarket exhaust, but still same size pipe until the cat. 2 years ago i had the same problem, very high HC, barely passed smog, and also my mpg isnt great as well, only about 22-21. its a 97 prelude. base model.

 

HC is usually caused by bad ignition, causing the motor to run lean. Could also be cat but you said you replaced that. Could have a leaky head gasket anything that will cause low compression. But for the most part just do a simple tune up, plugs, cap, rotor, plug wires and see if that doesn't bring it down. I mean you passed now so you dont have to worry about it. But those are the usual symptoms of High HC's

 

ok thanks.. i'll try that. i did pass, but its only good for 3 months. so i gotta do it again.

 

also to note: those few things like plugs, wires, cap, rotor you'd probably also see a little better fuel mileage but you are getting awfully low numbers at 21-22.

 

You need to clean your egr valve and ports. That's why the NOX was high as well. NOX is egr ports clogged and it caused fuel to not burn which is Hydrocarbons.

 

when is the last time your 02 sensor was looked at? egr could also be the culprit here