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Across 1. Directs the gases away from the engine 3. exhausts made from this don't go rusty 6. a silencer type which makes the gases travel 8. a form of steel which is easy to work and cheap 9. for fitting exhaust systems and to prevent leaks around the joints 12. stops the heat from damaging the vehicle underside 13. a chamber often found in two stroke exhausts 16. found inside the silencer 17. Makes the gases quieter 18. these are often made of rubber 20. the noise level measuring scale

Down 2. this type of silencer 'soaks' up noise 4. releases the gases from the combustion chamber 5. removes harmful gases 7. Joins the boxes together 10. found at the end of the exhaust system 11. a section of pipe which allows movement 14. the part which connects to the engine 15. seals the pipe to the box 19. usually fitted with a waste-gate or dump valve