As my HR Z has been sold the ART pipes are now available.   Bought from a forum member late 2016, have been on my car for about 12k.   The best decats you can buy for an HR, none of the rasp from regular decats with superb power gains (297 at the wheel on my HR with a cobra non-res - abbey mapped). Sounded lethal, 104.8db static with that setup but nice and quiet below 3k rpm, so no drone at all at motorway speeds - could not have been happier with the setup.   Cond