Downpipes for 35i/35is...
... have not been developed yet unfortunately. However the most reknown manufacturers in the US are looking for test cars, I wish I was in the neighbourhood. Whoever is interested think about it and contact them to save the planet. Among my choices would be:
CP-E
AR
Active Autowerke
Ultimate Racing
Macht Schnell
If you are unfamiliar with the gains of such an upgrade take a look in the 3series forum.
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