=)The collector pipe itself is 2-1/4" but it does step down a bit to 2.14" at the flange. This is needed so that the correct gasket can be used. The effect on power is negligible.
DC header = 2" collectordragontegz on Sep/13/02 said:i guess i worded things wrong. i was just saying that the stepped design of the exhaust system comptensated for the smaller collector of the comptech header.