i have a set of factory aluminum ones that i just had welded up.....we didn't weld the inner holes, just the out sides of them. Ive heard of them warping if you get it too hot so we didn't want that hassle and left the middle holes alone.
Ive seen where guys run them with no problems like I had mine fixed. The guy doing the work was a little slow getting them back to me and I proceeded on with my build and found another set already done. they look good.
Ill take $50 plus shipping if your interested shoot me a text 336-257-9101