ok this might sound like a dumb question , but i want to start replacing my rusty exhaust system but do to my budget restraints , i'll have to do it one piece at a time , so my concern is with making sure that what i buy will match up with what is stock ( 2000 GTP) until i get to the next part. i'm not trying to build a drag racer , just maybe improve the fuel mileage and overall performance and have something that won't need replaced in a few years like regular mufflers do . so do i start at the manifold with a zzp plog (headers are to pricey for me) and then go downpipe ? or maybe start with a downpipe ?
