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I’ll throw together that list during lunch today, and I’d agree with how you characterized the Synapse, it’s a nice clean pressure release sound…not the super high pitched/squeaky noise that the HKS unit makes. I’m very happy with mine, though I actually need to clean it off a bit soon, a tiny bit of oil residue is on it after a few months of blow by
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E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII
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