The exhaust is already in the car, sitting behind the 318. It will just get cut back from the manifolds to the header connection when the engine is in the car. It's really about manners and driveability, and vacuum for PB. The tricky part with cams seems to be having a cam that you can eventually grow in to with upgrades, like intake, head work, etc. Just trying to make the best choice. I actually like the sound of the exhaust with the 318, so we will see with the mild 440. Keep in mind, the engine builder/machine shop has said HP with this set up is going to be in the 325-350 range. Pretty mild. Thank you for your input. Much appreciated.