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I'd just be worried about torching my back bumper, and blistering the paint with one of those things. Sure the pictures look cool, but on the photo page take a look at that civic, or whatever compact that is, it's owning it's back clip, and your engine would be much worse.
the real ones actually cut the spark form the engine and send raw fuel through the engine and out through the tailpipe and it goes poof[sm=badbadbad.gif][sm=icon_flaming.gif]
p.s. this can be bad for the engine if you do it to much
man!!!! ddude now that is totaly bitchin!!! i want a set 2 for my ride!!!!! wooooooo too coolsweeet flames coming outa back like that [8D][8D][8D] luv it!!
For real, that is the stupidest thing i have ever seen in my life, but i have to admit, at one time, i wanted to do that to mine do, but i was going to make my own.