"Race exhaust" was my failure....my advice is just stick the originals back on before you go to the test centre.

They "sold me" some Db killers at the centre...they didn't fit very well, and there was no noticeable decrease in the volume/loudness of the exhaust to me (!!)...but they passed it. (and took my money)

There is no "noise meter", it's up to the discretion of the tester..

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2008 XTR Mods : DNA Stage 3 Airbox, PC111, Carbon Cans Ovals, Steve Ruth built XTR734cc Big Bore with - High Desert Dyno (HDD)/ Cuervo Racing Gas Flowed / Ported Head fitted with +1mm Valves & uprated Springs, HDD 5050 Camshaft, HDD +3mm Throttle Body, CP 105.5mm 11:1 Piston, Custom Mapping, Piasini ECU, Renthal 613-01, Barkbusters VPS, Pivot Pegz, Touratech Bashplate, Foam Grips, Kev's O2 Sensor Mod, Kev's Extra Coolant Cooler, Wilbers Progressive Fork Springs and Rear Shock