First let me say the quality of the Catted Grimmspeed Jpipe is unmatched by anyone else weld were clean, bungs were solid all hardware provided I had nothing to worry about. Install was pretty straight forward thanks to the video provided by Grimmspeed. All of my studs stayed in nuts came off without issues! I let the car sit for more than 24 hours and was completely cold when I put it on the lift at home. I started by pb blasting the turbo stud nuts I hit it with more pb blaster every 10 minutes for about an hour I started prepping everything else around it while doing so i.e. removed as many of the heat shields on the OEM J pipe as possible to make it easier to get to the top nut. removed the O2 sensors loosened bolt to trans mount and removed hardware from mid to I pipe. I used a six point socket a socket wrench with a very long handle to have more leverage and a long extension and universal for the top nut. Everything came off clean and I didn't have to replace any studs! I Changed the nuts with the provided hardware!