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I had the Tial on my 135i and quite liked the sound. Thought it would be a lot quieter than it actually was. I now have Turbosmart Dual Ports on my 1M and I originally wanted to vent to atmosphere but they really don't sound great. Now I run them recirculated.
I've heard the HKS and it is loud. If that's what you want, I would vote for that setup.
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