Changing the exhaust is the first modification most riders make. It's also the one that triggers the most surprises: non-compliant noise, engine warning light, MOT failure. An exhaust's compatibility goes far beyond whether it physically fits the bike.
Slip-on or Full System: What Changes
A slip-on (silencer only) mounts on the original manifold: simple installation, weight and sound gain, limited impact on fueling. A full system replaces manifold and silencer: real performance gains possible, but it changes engine scavenging and almost always requires ECU tuning.
The first compatibility check is therefore the scope: verify that the reference matches your exact model and generation/year. Two MT-07s from different model years don't necessarily share the same manifold diameter or lambda sensor location.
Type-Approval: The Marking That Counts
An exhaust sold as "road-legal" carries a European type-approval marking (E number plus directive number) stamped on the silencer, and comes with a certificate/CoC. Without this marking, the part is stamped "track/competition": forbidden on public roads, will fail the motorcycle MOT test now in force, and not covered by insurance in case of dispute.
The often-overlooked point: type-approval applies to the precise motorcycle + exhaust combination. A silencer approved for one model isn't automatically approved for another. The certificate lists covered models—it's what counts.
