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17s only slow you down if they are shitty ricey 17s and weigh a lot... liteweight 17s will be faster than lets say 15" blades off a 97 integra which weigh almost 30 lbs each.. why do you think porches and ferarris and all those top end imports come with 17s-18s and are really fast? they are made out of quality liteweight materials. and the header is 4-2-1, i looked at it...
4-1 header is for torque purely
4-2-1 is for torque and top-end horsepower, so depending on what you need the 4-2-1 is better
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