chochox

This is my first post in 6 months. Feels good to be back. while i was gone lots of new mods came out for the tl and i jus began to look into them. i recently got a ct catbaq. i cant complain since its power gains is noticable over the axle baq but i still think hks is better though. A while baq durin one of the tl meets i heard someone say that its a good idea to get your headers polished and put a ceramic coatin on it to get a few extra hp out of them. Does anyone know how much it costs to get headers polished and a ceramic coatin and where?
Ive also been lookin into changin the ct cone filter inside the icebox cuz its such a bitch to clean it. I asked someone and they said that you can replace it with one of k&n's universal filters. I think the part number is ru-2950. i wonder if anyone's done this and how is the performance after the replacement?
Does anyone know if ground wires are effective, not performance-wise but for electronics such as speakers and lighting?