Anti-lag can make a nice orangey kind of flash flame. But if your talking "Fast and the Furious" Style blue flame. You'll need a flame kit. But I'm not sure what type as normal flame kits do a orange burn.

Seriously don't do it though. The P-platers and Rice burners might like it but everyone else will just laugh at you.

Antilag is the only "proper" way. And at least with anitlag you'll get a somewhat of a performance increase as boost is instant as you come back on the throttle between gears.

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RS Liberty - Because WRX's are only good for parts...