This is straight from the horses mouth ( ADR website ) if ya dont wanna read this crap pretty much if ya have an engine thats got 150kw to 320kw the noise limit is between 80dB and 83dB unless if ya vehicle is over 3.5 tonne so yeah dont worry about it
For more ADR's goto
http://www.dotars.gov.au/roads/motor...dr_online.aspx
It takes a bit of reading
5.1.2 The sound level limit for M category vehicles with a GVM greater than 3.5 tonnes and an engine power of 150 kW or above is amended as follows: 5.1.2A Paragraph 6.2.2.1.2.2 of Appendix A is amended to read ‘Vehicle categories: with an engine power of 150 kW (ECE) or above but less than 320 kW (ECE) Limit values [dB(A)]: 80’.
5.1.2B A new paragraph 6.2.2.1.2.3 that reads ‘Vehicle categories: with an engine power of 320 kW (ECE) or above Limit values [dB(A)]: 83’ is inserted after paragraph 6.2.2.1.2.2 of Appendix A.
5.1.3 The sound level limit for N category vehicles with a GVM greater than 3.5 tonnes and an engine power of 150 kW or above is amended as follows:
5.1.3A Paragraph 6.2.2.1.4.3 of Appendix A is amended to read ‘Vehicle categories: with an engine power of 150 kW (ECE) or above but less than 320 kW (ECE) Limit values [dB(A)]:80’.
5.1.3B A new paragraph 6.2.2.1.4.4 that reads ‘Vehicle categories: with an engine power of 320 kW (ECE) or above Limit values [dB(A)]: 83’ is inserted after paragraph 6.2.2.1.4.3 of Appendix A.