It may not have been a back fire that caused the intake pipe to pop off loose clamp or weak or broken engine mounts could cause it but my guess if it came off at the air box the car would still run as you can unplug the MAF and the car will still run so I smell smoke.
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04 Audi A4 B6 1.8TQ S-Line 190bhp 6 Speed Duel SMIC
Milltek Exhaust|VMR boost Gauge|SP51 K04-15 Outlaw (K04-23+)|Samco Sport DV|034 Sport CAT (15bhp over stock)|TT MAF| 380 inj| Autobahn88 TIP|
To be fitted: B7 RS4 F-Brakes|B5 RS4 R-Brakes|SB Stage4 Clutch|