The CAT headers are a good deal but may require some extra work to get them right. Mine needed some die grinder work and welding at the merged collector area. Also welded around the tubes at the bolt flange. The headers must be installed from the bottom, one side at a time. Put a jack under the oil pan with the car on stands first. Remove the old header bolts, engine mount nut, then the engine mount bracket bolts from the frame. It should all fall out (caution the brackets are heavy). To replace slide the headers in and place the mount bracket between the tubes and replace the mount nut. Next put the bracket bolts through the frame and get them tight. You can now put the two outside header flange bolts in and hang the gasket on them. Pop another cold one, and put the rest of the bolts in. Put all the bolts in loose first then tighten. I’ve done this procedure to many times to count. Takes about a 6 pack. Good Luck
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