Ok so just a quick question. My headers are getting done this weekend and I was gonna go clean up then engine a bit and realized I haven't gotten spark plugs on my car in about 2 years. So the question is how long do they normally last or how often do you guys change them. Also do performance spark plugs really make a difference and if they do what type should I buy? I have an 01 tibby.

Just get the regular NGK plugs, performance plugs really aren't worth the extra money. I usually did mine every 15k mile or so on my Tib but now I have to remove an intercooler to get to my plugs on my mazda I'll probably be doing them less frequently lol...

Well I change mine pretty frequently (like every 3 months). The Hyundai owner's site says to do it at around 97,000 miles, but idk if I'd wait that long myself...