[Vital]

Interesting you might be the only person i know off that is experiencing drone from the Perrin exhaust either that or something is wrong with your install. Make sure everything is tight and check the vband connections.

Yes once you put the turbo it will sound different usually putting on a turbo quiets things down slightly ,but since you're installing an EL header and the OP/FP im sure it will have a good tolerable sound shouldn't be obnoxious. Im not running this setup so take my input with a grain of salt...