About Us

Steve Sieminkewicz


  • Co-Owner / Technician 
  • Originally from Latrobe, PA
  • ASE Master Technician 
  • Chassis Fab & HP Engine Certs.
  • 15 Years of professional automotive experience 

Wayne Irvin


  • Co-Owner / Technician 
  • Originally from Lancaster, OH
  • ASE Master Technician 
  • ASE Advanced Level Specialist
  • 25 Years of professional automotive experience 

Our Philosophy


  • Treat people right!
  • Always do good work.
  • Stand by our word.

Thanks to these simple ideas and our loyal customers, we have continuously grown our business over the last five years, completely by word of mouth.   Give us a try!

Basic Services Menu (Coming Soon)

6L80 Overhaul Timelapse

LS3 Camaro Build

Contact Us

Schedule Online

GMP Automotive Inc.

2511 Schieffelin Road, Apex, North Carolina 27502, United States