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I've seen STIs do this, given the A/F ratios I've observed during acceleration (with my real-time data aquisition) and that you're dumping a TON of fuel down there to keep everything cool in addition to what's necessary for combustion, there's definitely a good deal of unburned fuel comming out, and I'm sure that's what I've seen when I've seen the STIs do this, not some fancy "afterburner" setup.
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