Hey, I just joined the site, but I've referred to the site many times and you guys are awesome.

I have a quick question for you guys. Im gonna get an overkill pcm, but I was looking at the K&N cai or the home made fwi. Would either of those greatly affect the engine if I order a pcm for a stock car? Or should I wait until I install which ever intake and then get the pcm?

And how hard is it to install different exhaust tips?

Thanks guys