Audi · all OPF / non-OPF chassisFitment Guide
OPF vs Non-OPF: The Audi Exhaust Buyer's Guide
What the particulate filter changes about your build — and how to choose an exhaust that's still compliant in five years.
VCTR Editorial7 min read
Audi · all OPF / non-OPF chassisAustralian-delivered RS Audis from late-2018 onward carry an OPF (or GPF). The filter is part of the emissions design, not just the exhaust — your build path needs to respect that.
Non-OPF chassis
Pre-OPF cars (8V RS3, C7 RS6, early B9 RS4) can run a full downpipe-back system without legal exposure. The exhaust map is wide-open.
OPF chassis
OPF-back systems leave the filter and primary cat in place. They are emissions-safe, audit-safe, and locally compliant.
What to avoid
- 01Aftermarket downpipes that delete the OPF on a post-2018 chassis
- 02Decat midpipes sold as 'cat-back' to skirt regulation
- 03Any system without a stamped flange position on the OPF housing
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Curated for this platformAudi · all OPF / non-OPF chassis
Hand-selected hardware that fits the chassis discussed in this article. Confirmed against generation, engine code and regional spec.
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