Audi A1 and VW Polo 6R Unique Direct Fit Perfromance Filter.
 
This filter only fits these models listed
AUDI A1;
1.2 TSi
1.4 TFSi 122bhp
1.4 TSi 140bhp
1.6 TDi

 
VW Polo 6R
1.2 TSi 105bhp
1.4 GTi
1.2 TDi BlueMotion
1.6 TDi

 
This filter effectively turns the factory set up into a cold air feed with an oversize filter that locks into the factory airbox lid utilizing the factory grill intake and Airbox to keep the air shelided from the engine bay heat.
 
Improvements on power, torque, responsiveness, induction noise and recirc noise.