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Open TB

  ClioSport 172 Cup
Just been wondering this today. I`ve noticed when people run ITB's with trumpets they don`t use air filters. If this is OK for the engine why couldn`t someone with a single TB run that open without a filter??

  2005 Nissan Navara
Some race cars, or rather their mechs/drivers prefer not to, run filters...but this really isnt advisable least of all for a road car.