Downpipes
Which B58 Downpipe Fits My M340i, M440i or M240i? GEN1 vs GEN2 vs GEN3 LCI
Confused by BMW B58 GEN1, GEN2 and GEN3 LCI downpipes? Use this AZM fitment guide to match your M340i, M440i or M240i by chassis...
Technical guides
Guides
Fitment, materials, dyno data and tuning answers from the people who build the parts. Written by AZ Motorsport in Québec.
MaintenanceHow to Store Your Performance Exhaust for a Québec Winter
Storing a titanium or stainless exhaust over a Québec winter? Cleaning, oiling, and storage steps that prevent corrosion and staining.
DownpipesCatted vs Catless Downpipes: Which Should You Run?
Manufacturer-direct guide to choosing between catted and catless downpipes: power, sound, emissions and warranty. Dyno-proven, built in Québec — no customs fees in Canada.
