For some reason sxth includes arp nuts but not studs lolBefore you do, order more Turbo Studs from ARP I believe they are M10 X 1.25 or 1.50 X M48 and some good penetrating oil. The norm is the OEM's will break off. If you've got an impact and a long extension use it along with a multipoint socket.
https://www.sxthelement.com/Turbo-Outlet-Downpipe-Stud-p/mia-fst-030.htm
I won't lie to you either, they're tough buggers to get off. Best if you have access to a lift.
https://n-cars.net/forums/threads/360-380bhp-build.3792/#post-59700
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Are those replacement studs from sxth better than oem because from what i could tell they didnt seem too specific