That's a good question. The guys that have either one of them love them. Personally, the HH would work for me just because it is cheaper. You could also get one of the universal FMF slip ons. I liked that. I plan on doing a timed test on the Helix once I get my hands on one to verify the power difference. The advantage on the HH or the MRP is the downpipe itself is a bit bigger providing more air flow. Using a slip on you still have the stock size down pipe / header.
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