Look for "The Great Intake Challenge" Thread. They will be testing all the intakes on a dyno. You don't say what engine you have. If a 3.6 the upgrade to the CTS-V exhaust is only about $125 including installation. Several of us have done this mod and are pleased.youngmane said:How much HP can a new exhaust get me, i already have the K and N air filter.
The Marine installed the Cadillac MotorSports Shorty Headers and high flow Cats. He plans a dyno run soon. Combined with a good flowing exhaust and mufflers this is supposed to add up to a real nice HP gain. But also pricey.Mbai2 said:New headers for a 3.6L will also get you a nice increase in output. At the moment, only Cadillac Motorsports run by pietro and Lund Cadillac sell them.