Why did you make another thread for the exact same thing? Go buy Vibrant 12" or 18" resonators and have them installed. That or buy 2 high flow cats and have them installed. You have no other option, period.
Does the stillen already have 2 resonators in the mid pipe?? If not then you need to buy 4 resonators. There's a reason some test pipe makers sell resonated test pipes.
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