I would prefer scientific analysis data before I go replacing them all, including IC hoses.
Example: If it takes $400-500 in hoses to gain 2hp and 3 lb ft...forget it. I paid $400 for my used Borla exhaust and get much more out of it now and in the future when I get the IC/AP installed.
Imho, biggest gains: AP, IC & exhaust. YM and opinion MV....lol
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