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Perrin has a silicone intake tube with a gradual bend. There are dynos out and about, you just need to find them. If I recall correctly, it came out to 1hp MAX. But take into account that each dyno run there is 1-2% margin of error, which is pretty much that 1hp. Some believe that it will flow more smoothly with a gradual bend instead of the 90degree bend.
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