Has anyone used them and had good results? I've read good and bad, but I haven't heard anything. Of course the local motorsport shops are trying to pimp them to me, but I'm curious what actual non-profiting users have to say. The ones I've looked at are the SFC-VTEC and the Apex. Any comments or suggestions? Also I'm about to add on Borla PROxs mufflers and Borla Carbon Fib tips, last chance to help me from having to kick myself in the A$$!

 

the vafc is a cool toy. doesn't really help that much and you would have to get it dyno tuned for it to help at all. it does look cool as hell, though. when i was into all the performance sh*t i had it. i didnt regret getting it.

 

They don't really do anything. They are just mainly for looks.