These aren't off the shelf hardware store chinese junk, these are hardened OE studs.
Due to the countless number of heat cycles yours have been through, it makes the studs incredibly brittle. When you try to remove yours, you’ll pull most of the aluminum from the thread holes along with them. The last thing you need when installing a new engine is to break a stud during install. Take our word for it, you don’t want try to re-use yours.
Our kits include the correct number of studs, nuts and exhaust plate/secondary air injection bolts as needed for your specific year truck or Celica.
OE parts and will work with either factory exhaust manifold and most aftermarket headers