TK-421 Tuning

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TK-421 Tuning

TK-421 TuningTK-421 TuningTK-421 Tuning
  • Home
  • Dyno Data
  • Appointments
  • Vehicles
  • FAQ
  • Videos
  • Reviews

Frequently Asked Questions

Please reach us at tk421tuning@gmail.com if you cannot find an answer to your question.

   •  We will verify your truck's software version and update it the latest version at no additional costs.


   •  Our ECU Flashes do not modify the OEM ID, which means it will always report back as a "stock" part number when the dealer reads your software version.


   •  NEW! Our 3.5L Toyota Tacoma tunes are now 50 State Federal Legal including full California Compliance.

   •  Our other tunes are not CARB certified, however because we do not tamper with emissions controls, smog codes, check engine lights, our tunes have had no issues passing smog as they are "smog friendly".


   •  No tuning cannot adjust your speedometer for larger tires, however there are other aftermarket options available such as Rough Country or HyperTech.


 •  If the warranty issue in question is caused directly by the tune, you could potentially have your warranty voided on that item. These tunes however are 99.9% undetectable by the dealership. We make no guarantees or promises that tuning will uphold your vehicle's warranty, HOWEVER many of our customers have had their trucks at their local dealership with no warranty problems or issues. Please use your best discretion when considering tuning your vehicle.


 • More torque and power, see our Dyno Data page for more details.

 • Enhanced/smoother shift points.

 • Reduced gear hunting

 • Reduced Lag

 • Improved all around drivability

 • Adjust vehicle for different aftermarket gear sets


 • 87-93 Octane on most applications

 • Our supercharger tunes require 91+ octane.

 • If your manual requires you to use 91+ octane, please use manufacturer's recommended fuel type.

 • E85 Ethanol not approved to be used in non-flex fuel vehicles. We cannot adjust or modify vehicles to run E85.


 • Cash, Venmo, Zelle, PayPal

 • All major credit cards accepted with 8.75% sales tax.


 • MPGs are NEVER guaranteed, you can potentially see gains if you drive normally and do routine maintenance.

 • If you're looking strictly for a tune to save MPG only, please do not get your vehicle tuned.

 • Most customers will see net zero gains/losses, but those who are conservative can see some improvement with MPG.


TK-421 Tuning Inc.

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