any information about emissions tests i can read about?

or know about how strenuous they are?

Your n4 don't say which state you are in, It is not a standard issue of one size fits all it is a matter of state standards in other words they set the rules for waht to look for ie: California is the most strick God#85)*&6 state in the union and only god can get you through their test if you have modded your car in any way.

Most states other than Kalifornia and from what I read Maryland don't My give you much of a hassle.

You hafta check with local laws then get back with us and tell us if you expect to have any problems before yoy go take the test.

My personal advice is If you live in Kalifornia and have put a header on make sure it is Carb approved as with any mods and it is wrapped because it will trip up a bad working overly sensitive machine up to say you are not burning up all ya fule. Trust me I had the same problem and it was not funny at all to hafta run all over town tilll I found a proper working machine. ;)

Next time I'll have my header wraped up like a baby and a coil pack with fresh plugs.