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[logo20]

Can anybody tell what could be the problem?  and what is NOx(ppm)?  It seems the standard is 1258 and i got 3248, and the second one is 1378 and i got 3391.  
I got K&N cone filter, magnaflow muffler, and pacesetter header.  I hope the cheap header is not the problem.

[kanekz]

It's time to pay someone off....o wait, that's illegal. &nbsp; <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt=':p'>

[logo20]

thanks a lot for the reply, I guess I need a mechanic to check my car.

[SR20Fastback]

I dont know anything about those numbers, but did they tell you spefficely what may be wrong with the car?

[logo20]

They didn't tell what was wrong with it. &nbsp;The guy just said that it might need a tune-up, but i don't think so because i take care of my car. &nbsp;
I've been searchin about NOx and it means oxide of nitrogen. I'm thinking it might be the E.G.R. (exhaust gas regulation) valve, or any other valve but i don't know. &nbsp;I have to get it checked out.