pre-CAT (up stream) Oxygen Sensors by BOSCH
Part Number: 13477
Alternate Part Number: 13802

post-CAT (down stream)
Part Number: 15109

BOSCH MAF
Part Number: 0280217814 (BOSCH Part 0 280 217 814, BMW Part 13 62 1 433 567)

i'll post any improvement. (will also be cleaning my intake filter.)

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