What adverse effect would having a custom drilled wheel pattern have on the integrity of a wheel?

Reason I ask is there is a deal on Rota Slipstreams on the groupbuycenter. $450 shipped for 15s and $600 for 16s but you need 10 people to order a custom wheel pattern (the Focus has a funky 4X108 pattern). I was thinking these would make a nice autocross wheel.

 

I could have SWORN the focus was 4 x 100.....


i wouldnt redrill it though.. there are other choices....

 

Hey Alan talk to jason. He sells them for cheaper than that... Let me know if you want to try slapping a 4x100 rota on the focus to find out!

 

I guarantee it is 4x108. This makes the aftermarket wheel choices for the Foci very limited at the moment unless you opt for the custom drilling route.