Have you ever went to remove an exhaust stud and the stud and nut comes out as a pair? Have troubles installing exhaust studs by having to double nut them? These upgraded exhaust studs use a torx head for M7, or allen for M8 studs for easy installation. Don't waste your time with the older style exhaust studs anymore. 
 
**PLEASE CHOOSE THE CORRECT SIZE**
M7 - FITS M42, M44, M50, M52, S50, S52, M54, S54, N54 (E TORX)
M8 - FITS M10, M20, M30, M60, M62 (ALLEN)