i suggest getting rid of the factory plugs in these cars ASAP, the motorcrap plugs break WAY too easy........my local speed shop has plugs that are a 1 piece design and wont break off like others........i dont remember what they where called, but the name started with a D (not denso)........the plugs will get siezed up in the heads, not a good thing........if its original plugs, get them replaced!
2007 Mustang GT premium
*Bassani O/R X- Bassani axle backs
*custom grind Comp cams
*Eibach Pro Kit-J&M LCAs
TRIANGLE SPEED SHOP, Orange, Tx
312rwph (mustang dyno, stock intake)