We are currently building the store/website. Sorry for any inconveniences you may run into.

EFI Wiring Specialist

At SMI, we specialize in professional EFI wiring solutions. From custom harnesses to one-of-a-kind electronic modules.

Lifetime Warranty MAP Sensors

  • Potted 3 Bar MAP Sensor GEN 3 TRUCK STYLE - LQ4 LQ9 L33 LM4 LM7 L59 LR4
    Regular price
    $49.99
    Sale price
    $49.99
    Regular price
    $59.99
    Unit price
    per 
    Sold out
  • Potted 3 Bar MAP Sensor GEN 3 CAR STYLE - LS1 LS2 LS6 LS7
    Regular price
    $49.99
    Sale price
    $49.99
    Regular price
    $59.99
    Unit price
    per 
    Sold out
  • Potted 4 Bar MAP Sensor GEN 4 LS - LS3 LS9 LSA Holley Intakes
    Regular price
    $49.99
    Sale price
    $49.99
    Regular price
    $59.99
    Unit price
    per 
    Sold out

Holley Terminator X Systems

  • Holley EFI CAN TO USB DONGLE - COMMUNICATION CABLE/ Tuning Cable 558-443
    Regular price
    $69.10
    Sale price
    $69.10
    Regular price
    Unit price
    per 
    Sold out
  • Holley EFI TERMINATOR X MAX 24X/1X EV1 LS MPFI KIT WITH TRANSMISSION CONTROL 550-916
    Regular price
    $1,599.95
    Sale price
    $1,599.95
    Regular price
    $1,626.00
    Unit price
    per 
    Sold out
  • Holley EFI TERMINATOR X MAX ECU ONLY, No Harness 554-153
    Regular price
    $1,004.95
    Sale price
    $1,004.95
    Regular price
    $1,117.00
    Unit price
    per 
    Sold out
  • Holley EFI GM 2003-2007 Truck SUV Drive-By-Wire Harness Dominator, Terminator X MAX 558-429
    Regular price
    $205.95
    Sale price
    $205.95
    Regular price
    $229.00
    Unit price
    per 
    Sold out
  • Holley EFI DOMINATOR ECU ONLY, No Harness 554-114
    Regular price
    $2,567.95
    Sale price
    $2,567.95
    Regular price
    $2,854.00
    Unit price
    per 
    Sold out
  • Holley EFI GM 2009+ GM 4L60E TRANSMISSION CONTROL HARNESS Dominator, Terminator X MAX 558-455
    Regular price
    $220.95
    Sale price
    $220.95
    Regular price
    $250.00
    Unit price
    per 
    Sold out

YES, WE HAVE HOLLEY CAN SPLITTERS

We have tons of Holley EFI CAN splitters in stock, and more being made every day!

Buy here

7" Digital Dash Fuel Level Harness

Buy Here

Holley EFI CAN Connectors available!!

Visit our store listing

GM Alternator Information!!!

Read it here!