Hmm, thats odd. they should mount right on to the OEM midpipes. The SS reps should fit exact no work needed. now the GEN3's I don't know.. hmm. Just take it to a muffler/welding shop and they'll fix it cheap!
2013 Nissan Nismo 370Z - Current
2004 Non-M Facelift Coupe - Current
2006 BMW M3 - SOLD