What Is a High-Flow Cat?
A high-flow cat is a less restrictive catalytic converter. Here is what that means for sound, smell, check engine lights, legality and tune planning...
Technical guides
Guides
Fitment, materials, dyno data and tuning answers from the people who build the parts. Written by AZ Motorsport in Québec.
B58B58 Gen 3 Downpipe Checklist: M340i, M440i, Tune and Fitment Questions
Shopping for a B58 Gen 3 downpipe? Use this M340i/M440i checklist to confirm Gen 1 vs Gen 2 vs Gen 3 fitment, catted-vs-catless choices,...
DownpipesMcLaren 600LT/675LT Downpipes vs X-Pipe Exhaust: Tune, CEL and Fitment Checklist
Compare McLaren 600LT/675LT downpipes with a 600LT X-pipe exhaust by sound, tune/CEL planning, catted-vs-catless choice, fitment checks and Quebec install questions.
8VAudi RS3 Downpipe Install Cost, Tune and CEL Checklist: 8Y/8V Buyer Questions
Pricing an Audi RS3 downpipe install? Use this 8Y/8V checklist to plan quote factors, tune/CEL risk, catted vs catless choices and fitment before booking.
DownpipesLamborghini Exhaust Price: Aventador, Huracan and Urus Quote Checklist
Shopping for a Lamborghini exhaust in Canada? Use this Aventador, Huracan, Urus and Revuelto quote checklist to compare materials, valves, downpipes, headers, installation, shipping...
AMGMercedes E63 Downpipes Checklist: W213 Fitment, Tune and CEL Questions Before Ordering
Shopping Mercedes E63 downpipes for a W213 or S213 E63 S? Use this fitment-first checklist to confirm chassis, catted vs catless choice, tune/CEL planning...
DownpipesFerrari Purosangue Exhaust vs Downpipes: Sound, Valves, Fitment and Buyer Checklist
Choosing between a Ferrari Purosangue exhaust and downpipes? Use this AZ Motorsport checklist to compare sound, valves, fitment, tune/CEL planning and Quebec/Canada ordering questions...
DownpipesMercedes GLE63 Downpipes Checklist: W167 Fitment, Tune and CEL Questions Before Ordering
Shopping for GLE63 downpipes? Use this W167 checklist to confirm fitment, tune/CEL planning, catted vs catless choice, install prep and Quebec ordering details before...
BMWBMW M3 Exhaust Upgrade Checklist: G80 vs F80, Valved Exhaust vs Downpipes
A fitment-first BMW M3 exhaust checklist comparing G80/G82 S58 and F80/F82 S55 paths, with exhaust-vs-downpipes planning, tune/CEL questions, daily-use notes and Quebec buyer checks.
BrossardModified Exhaust Quebec Checklist: Questions to Ask Before You Buy, Build or Book
Planning a modified exhaust in Quebec? Use this checklist to compare repair, fabrication, cat-back systems, downpipes, headers, drone, CEL risk, quote scope and local-use...
DownpipesMcLaren Exhaust System Buyer Checklist: Match Your Model Before You Order
Shopping for a McLaren exhaust system? Match your model family first, then compare race exhaust systems, downpipes, and X-pipes before ordering or booking an...
DownpipesAZM Catless Downpipe Checklist: CEL, Tune, Fitment and O2 Spacer Questions Before Buying
Buying an AZM catless downpipe? Confirm fitment, tune/CEL planning, O2 spacer expectations, sound, smell, install prep and Quebec road-use questions.
