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its running a 400mm long x150 dia 2.5" bore straight through box. problem i have is the sound meter is help .5m from the tail pipe so the meter is picking up all the background engine sound as well. striaght cut cam gears, porsche fan and the intake roar. hence why i'm moving the exhaust exit to in front of the rear wheel, gets the sound meter further away from the engine so hopefully should make a bit of a differance.
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