[soi3847]

Models for MPE tuning are available starting with the 330i.
but 320i is same 330i exhaust line.
so... change using 330i MPE parts.
and I Change Rear Diffuser to M340i M Performance, Muffler Tip.

-MPE Parts Number-
M Performance Exhaust for 320i, 330i
18302464496
M Performance Carbon Muffler Tips for 320i, 330i
18302464500

-MP Diffuser Parts Number for M Sports-
51192455856 - Bumper Diffuser (Circle Tips)
with
51192455821 - High Gloss Diffuser
51192455819 - Carbon Diffuser

-MP Diffuser Parts Number for M340i-
51128079607 - Bracket (or cutting your parts)
51471911992 - Bracket Rivet*8 (using your parts)
51718091107 - Under Diffuser (or cutting your parts)
51192455859 - Bumper Diffuser (Dual or Square Tips)
with
51192459740 - Carbon Diffuser
51192455821 - High Gloss Diffuser

Cerium Gray Muffler Tip
51128058659
51128058660
or
Black Muffler Tip
51128093303
51128093304

Go DIY (watch my video or repair guide)