There is actually another guy on here who used those headers. He said he had to so some grinding and test fitting. He also had to get his couplers on his stock downpipes widened to fit these headers because they are too big. Hopefully he will chime in here.
Spend a little extra for these http://www.summitracing.com/parts/SUM-G9045/?rtype=10
I bought them and they literally bolt right in, with no issues at all. They are auctually pacesetter shorty headers. The same ones they sell for $233 bucks. Also make sure to spend the money on a set of aluminum gaskets. http://www.summitracing.com/parts/MRG-5949/
TRUST ME ON THIS!!!