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Hi Bobby,
I have been where you are going, I have a G-Force with an LS1. I am in NSW and our DB ratings are very low, so very challenging to get through. 1) restrict throttle to 1/3rd. 2) forget the sidepipes, go one single exhaust, with at least 2 mufflers in-line. 3) get some lead impregnated foam matting and encase the complete engine compartment, under over,sides, everything 4) use an old commodeore air pod, have about 2 metres of hose leading to it and absolutely stuff the pod full of foam, make sure the engine can't suck any foam in. If you do all that you should get through first time. Out of six cars that were being tested on the day mine was the only car that passed!! 2 db under. All the other cars on the day were at least 5db over, some as much as 15db!! Rob...happy to field any questions drop me a line 0411487527
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