Earlier quoted context omitted.
A lot of non-regular-maintenance jobs are easy & quick to do but break the law - for example, deleting the catalytic converter or EGR from the exhaust system will give your engine better performance and economy, but is illegal since it increases emissions. Lots of places will do it anyway on a cash job if they think they can get away with it, because it's relatively easy money. A shop replaced my failed catalytic con…
> A shop replaced my failed catalytic converter ($1200+ > replacement) with a straight pipe ($20 pipe and $200 of > time) many years ago because they (correctly) assessed me > to be a broke-ass student who wouldn't tell on them. The mechanic may have even made even more money by scrapping your catalytic converter. In the UK, swapping the exhaust out for a straight pipe is a common (illegal) modification for greater p…
Oh, certainly. Not to mention that removing it would have been a larger & more difficult job, which I'd have to pay for... OR they can get less money but it's (very) easy money.
>completely removing the air-filter (dangerous)
Good god... Who the hell does that? What ricer would willingly risk killing their motor from eating some leaves (or a piece of gravel!) for a minuscule performance increase? The risk:reward scale there is just bananas.