Related by context. Frequent words. (Click for all words.) 70 catalytic converter 50 exhaust emissions 49 spark plugs 47 scrap metal 47 palladium 46 internal combustion engines 45 brake pads 45 tailpipe emissions 45 metals 45 radiators 45 lawnmowers 44 automobiles 44 mufflers 43 diesel 43 alloys 43 aluminum 43 furnaces 42 copper wiring 42 Johnson Matthey 42 lithium ion batteries 42 cars 41 diesel engines 41 copper 41 rims 41 pollutants 41 car stereos 41 electric motors 41 electrics 40 automotive 40 lawn mowers 40 diesels 40 diesel fuel 40 refrigerant 40 stereos 40 garages 40 cleaner burning 40 plastics 40 air conditioner 39 diesel exhaust 39 lithium batteries 39 emissions 39 mowers 39 thefts 39 turbochargers 39 mercury emissions 39 diesel powered 39 air conditioners 39 air compressor 39 copper wire 39 diesel engine 39 pollution 39 vehicles 39 exhaust 39 welding 39 Emissions 38 Aluminum 38 acid batteries 38 nitrogen oxides 38 manhole covers 38 air conditioning 38 thieves 38 motors 38 smelting 38 gasoline 38 alloy 38 boilers 38 carmakers 37 automobile 37 Hondas 37 recyclers 37 metal 37 smelters 37 ferrochrome 37 muffler 37 Carmakers 37 batteries 37 auto 37 automakers 37 compressors 37 emission 37 engines 37 pawn shops 37 alternative fuels 37 turbocharger 37 powertrains 37 steering column 37 oxides 36 solvents 36 wood stoves 36 precious metal 36 tires 36 powertrain 36 sulfuric acid 36 photovoltaic cells 36 unleaded petrol 36 exhaust pipe 36 break ins 36 nitrogen 36 Crown Victoria 36 ferrous 36 junkyard