The EPA tester only tests the exhaust, he dosen't care abour mods, as long as the car is under the limit (in vic its 40dB) So yeh, he places a microphone about half a meter away from the exhaust and accelerates to about 5K(for me at least), that's it. It takes about 5 minutes, it's a shame they charge you $41 for it Check out my post: http://www.skylinesaustralia.com/forums/topic/422583-so-i-got-epad/ and read post #14, that's how i passed it