A timbre-scaled exhaust system comprising: - an inlet collector including an entrance duct at a first end of the collector in fluid communication with an exhaust pipe from an internal combustion engine and an exit duct at a second end of the collector in fluid communication with a plurality of non-perforated tuning tubes ; - an outlet collector including an entrance duct in fluid communication with the plurality of non-perforated tuning tube and an exit duct in fluid communication with an outlet of the exhaust system; wherein the plurality of tuning tubes are parallel and are adjacent such that the tuning tubes contact one another along their lengths, and the plurality of tuning tubes are in fluid communication with the exit duct of the inlet collector having lengths and diameters selected based on a desired note of the timbre scaled exhaust system; and wherein the inlet collector splits the exhaust flow through the plurality of tuning tubes to create individual notes, and wherein the outlet collector combines the split exhaust flow to create a desired sound of internal combustion engine exhaust, characterised in that the tuning tubes either - comprises at least a first tuning tube having a diameter, the diameter selected based on a first desired note and at least a second tuning tube having a second diameter that varies from the diameter of first tuning tube, the diameter of the second tuning tube selected based on a second desired note, or - comprises a first tuning tube having a first length and a second tuning tube having a second length that is greater than the length of the first tuning tube. - an inlet collector including an entrance duct at a first end of the collector in fluid communication with an exhaust pipe from an internal combustion engine and an exit duct at a second end of the collector in fluid communication with a plurality of non-perforated tuning tubes ; - an outlet collector including an entrance duct in fluid communication with the plurality of non-perforated tuning tube and an exit duct in fluid communication with an outlet of the exhaust system; wherein the plurality of tuning tubes are parallel and are adjacent such that the tuning tubes contact one another along their lengths, and the plurality of tuning tubes are in fluid communication with the exit duct of the inlet collector having lengths and diameters selected based on a desired note of the timbre scaled exhaust system; and wherein the inlet collector splits the exhaust flow through the plurality of tuning tubes to create individual notes, and wherein the outlet collector combines the split exhaust flow to create a desired sound of internal combustion engine exhaust, characterised in that the tuning tubes either wherein the plurality of tuning tubes are parallel and are adjacent such that the tuning tubes contact one another along their lengths, and the plurality of tuning tubes are in fluid communication with the exit duct of the inlet collector having lengths and diameters selected based on a desired note of the timbre scaled exhaust system; and wherein the inlet collector splits the exhaust flow through the plurality of tuning tubes to create individual notes, and wherein the outlet collector combines the split exhaust flow to create a desired sound of internal combustion engine exhaust, characterised in that the tuning tubes either - comprises at least a first tuning tube having a diameter, the diameter selected based on a first desired note and at least a second tuning tube having a second diameter that varies from the diameter of first tuning tube, the diameter of the second tuning tube selected based on a second desired note, or - comprises a first tuning tube having a first length and a second tuning tube having a second length that is greater than the length of the first tuning tube. <EOS>