i was wondering about the bolt on sfc do you have to drill holes, or do they just directly bolt into holes in the frame already???

 

For most of them, you have to drill your own holes.

 

Dare I even ask why you are considering this? I got the Alston Racing ones and they were bolt on/weld on ones and I had them welded in. I would never do bolt on because the bolt holes could elongate over time and it is never as secure.

 

Usually they bolt to the trailing arm front mount, and you have to drill holes to mount them to the front subframe.

You really should get them welded though.