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We designed Hi-Flow velocity stacks and there various designs are the accumulation of 20 plus years of testing on our flow bench, dyno and track testing to get the best flow and performance possible. Pair them will a washable element air filter for keeping a clean engine running strong. 

Caution! Only clean filters with air filter cleaner or soap and water and let them dry over night. Anything else may damage the filters Do not under an condition use compressed air or hair dryer or any heat source to dry air filters.