JCW Helix blow-off value
I'm using that one. Don't recall where I purchased it from but I do really like it. I looked at others but due to the simple installation of the Helix I went with that model and could not be happier. It provides plenty of sound but not obnoxious. It's quite a bit louder if you also have a CAI. Otherwise it's located down under the factory air box which muffles it a bit.
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