[kzrdude]

(Sweden situation). There's recurring inspections of any vehicle, binannually or something maybe for motorcycles. The HD people I know/knew, would change back to the stock pipes for inspection, because the loud ones were not legal to use. Then just change back again.

[moonchrome]

Or they just add/remove the DB killer (removing a small plug vs dismantling the exhaust)

[foepys]

With Euro4 and later exhausts this is no longer possible. Db killers need to be not removable, so you need to replace the whole slip-on.

[moonchrome]

Had a friend who put an Akrapovic on his MT-07 - DB killer is welded but once you drill through a small part on the weld you can remove it/put it back easily and the drill hole is covered by carbon shield so unless they disassemble the shield to check (and my friend had it like this for 5 years before selling IIRC) it was just pull out - put it back in for technical

[nitrogen]

Just curious, do these changes affect power output in either direction?

[rolleiflex]

Generally, well designed bikes assume a certain pressure in the exhaust pipe and use it as a way to compute the internal combustion cycle timings, since it affects the movement of air and how long it stays and how fast it is likely to move on. So changing the pipes without doing anything indeed affects performance. That’s why most pipe changes usually also come with a reflash of the bike’s ECU so that the onboard computer can know new pipe’s air resistance parameters.

[arglebarglegar]

yes this is exactly what people do with modified cars too