Well. The 370z Tomei exhaust will be LOUD. It will also hang very low so you will have to deal with that (I fixed mine by hose clamping it upwards). The Motordyne will be more tame but still have a good tone to it. It would be like comparing and single exit exhaust with a dual one really.
To touch on the Db range. I know that my Tomei cold start with no silencer (Res TP and Tomei y-pipe) is well above the 120 Db range. At about 3k RPM, if you step on it, is when you get the blaring trumpet like noise of the VQ.
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Takeda CAI : FI Resonated TP : Stillen UD Pulley
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