If you get a good one, it might actually do its job... They'll ALL work (you don't know how manyt times i've heard from kids with the cheapo ones "Well it works fine.... it isn't broken or anything... der-de-der" :lol: ... anything is better than nothing, but if you want it to actually work and be stiff, buy right.
i.e. not a cheapy ebay one :wink:
And no 3-pointers... the firewall was never designed for that sort of load. You may do nore harm than good.