Intake and exhaust can be big power adders though it just depend on if your talking a fart can or header and cat back and a cold air or short ram. with header cat back and cold air you could be looking upwards of 20-30 hp which would then put it in contention with the ss or the redline but stock to stock there is no way :blackeye:There are some videos of a civic with just an intake and exhaust running a 14.1 or 14.2. He was power shifting and had let some air out of his tires for better traction.