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I have a JB4 with dual cone intakes. I'll do a charge pipe and intercooler next (for reliability) and then add down pipes for sound.
I chose the JB4 over the MHD for a couple of reasons. It's very easy to change tunes with the JB4 and I didn't want to take the chance of "bricking" the ECU every time I wanted to make a change. Theoretically the MHD is superior, but I believe either option is effective.
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2011 BMW Z4 35i 6sp wh/rd
2017 BMW M4 Comp DCT blk/blk
2001 Porsche 911 Turbo 6sp blk/blk
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