i had the pypes MM and an O/R H for about 4 days. it was very loud!!!!! sounded really deep- friggin awesome!!! If the car wasnt a daily driver back then, I would have kept the O/R H, but i was being a vagina and put the stock H back on (& sold the O/R H).
post vids when you get everything slapped on. Good luck getting the tips to match evenly!!!