High Performance Custom Marine Inc CMI 496, 454, 502 E-Top/Uni-Top Style Headers:

West Coast Offshore carries all the CMI 496, 454, 502, 520, 540 E-Top/Uni-Top Style Headers.

More About CMI 496, 454, 502, 520, 540 E-Top/Uni-Top Style Headers:

  • No additional custom tailpipes to buy – these true plug-and-play systems eliminate the need to remove the stock exhaust hoses to install.
  • These kits introduced CMI’s low-cost satin finish. Classic high polished stainless finish is available for additional charge.
  • No cast parts to crack; forged and mandrel bent high quality American-made 316L Stainless Steel.
  • Improved water jacketed protection compared to stock exhaust and seamless water-jacketed header design reduces crack potential.
  • Same semi-automated high quality welding CMI uses on all racing header applications.
  • CMI “Cool Collar” flange design eliminates risk of water entering motor by the head flange.
  • Competitively priced with other aluminum/stainless header systems but with superior performance and extended life span.
  • Fully post-manufacture annealed to reduce stresses.
  • Sophisticated engineering leaves stock oil lines in place and only requires relocating the oil filter with a supplied bracket.
  • Exhaust Water Temperature Bungs are installed as standard equipment.
  • Gives a racing look to stock engines.
  • 1 7/8” Inside-Diameter primary tubes to get peak horse power and torque.
  • Works on 34.5” drive centers.
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