Horsepower Connection (The EFI Store)
Lake Havasu City, Arizona, United States
Tunes Haltech and Holley EFI on its own chassis dyno and engine dyno. Listed by Haltech and Holley EFI as a dealer, so you can buy the ECU here too.
At a glance
- Tunes
- HaltechSells too
- Holley EFISells too
- Dyno
- Chassis dyno and engine dyno
- Address
- 55 South Lake Havasu Ave, Unit F #392
Lake Havasu City, AZ 86403 - Phone
- 928-706-6112
- Website
- theefistore.com
Other dyno tuners nearby
- Doug's DynoHenderson, NV · 114 mi · AEM, Haltech, MoTeC
- Sin City PerformanceHenderson, NV · 116 mi · Holley EFI
- Eurotek Tuning (ETEK)Las Vegas, NV · 120 mi · Haltech, Link ECU
- WinWithDom (DomTuned)Las Vegas, NV · 123 mi · Haltech, Link ECU
Still choosing an ECU?
Entry units from the brands Horsepower Connection (The EFI Store) tunes:
- Haltech Nexus T1from US$935
- Haltech Nexus T2from US$1,215
- Holley Terminator Xfrom US$1,600
- Holley Terminator X Maxfrom US$2,000
How this listing was checked
Report a mistake on this page. Listed because there's evidence it tunes aftermarket ECUs and has its own dyno. "Sells too" means the ECU maker lists it as a dealer. Checked October 2026. Listings are free and shops can't pay for placement.