Quick bolt size question...

What size are the two bolts that connect the exhaust manifold to the downpipe? I would typically remove one and bring it to a hardware store with me, but I need to pick them up at lunch today while at work.

Thanks!

Those are special bolts with a splined shank that is pressed into the manifold flange. If you punch them out, you'll find that the holes left behind are pretty big. You can replace them with ordinary 3/8 inch bolts, but make sure that you have washers for both the nut and the bolt head, to compensate for that large hole.