Felpro 1008's

Kind of depends on your aplication. for me I race oval track run my motors 6500-7000k for 20 laps in 100+ degree summer heat. so every little bit of help I can get is a plus. If the rules alowed it I would put more water between the center exhaust valves and scavange some from the rear but I cant do any external mods so I do them internal. for drag race or street use the factory setup is fine.