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Is the RS2 engine OEM air filter different from S2. I remeber trying to order the RS2 version for the S2 but the part nos were identical??

The OEM air filter for the RS2 is part no.:
191 129 620

This is the same as for the later ABY engined S2. The earlier 3B engined S2 uses a different air filter with part no.:
069 129 620

If you need to get one the best place is from Martyn at VAG Parts here

Hope that helps

Cheers

Yup the air filters are identical, the only difference between ABY and ADU airbox's is that the RS2 has a larger inlet trumpet compared to the S2's