Seriously, if you guys want to see some serious smoke, keep it below about 2000 RPM's for about a week or so and make sure to accelerate easy during that week long period. Then when you want to see the smoke, just get the engine to an RPM level the turbo will readily spool at, and place your right foot on the firewall. I suspect the stock muffler or cat does tend to trap the soot collected from easy operation and blows it out on harder acceleration. I have definitely noticed a trend that if I go easy on it for 1/4 tank or more and then hammer it, you get serious overfueled looking smoke. It'll be interesting to see if it behaves differently with my new MBRP 600 muffler kit and cat "test" pipe when it arrives. I'm guessing it doesn't store up soot anymore with that combo.