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Most likely it's the opposite. When you're WOT in 2nd, your car is probably rich (and you want it to be). Next you close the throttle to make the shift, the fuel system takes a microsecond to adjust and in that time dumps a bunch of fuel that doesn't fully burn in the cylinder because you've shut off the air supply (throttle). When that raw unburnt fuel hits the hot turbo and muffler, and is in the presence of some oxygen, it ignites - you hear a nice 'boom'
At night you'd probably see the flash of some flames shooting out the exhaust pipe.
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Jacob
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
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