Do we have a physical location

Yes, FNP Tuned is located at:

976 W 850 S, Woods Cross UT 84087

Can I tune with my Cobb Accessport?

Yes, we are Cobb Pro-Tuners.

Do we sell parts

Yes, check out our online store.

You can also contact us for bulk pricing.  If you are looking for power upgrades and would like information on what is available and options for your vehicle, please contact us.

Flex-Fuel Info

We can tune a lot of stock ECU’s now with Flex-Fuel.  For more information on Flex-Fuel check out our page dedicated to it:

Here is a 2016STI tuned via Cobb’s Flex-fuel!

Horsepower Expectations

Often I am asked what horsepower will my car make with a given set of modifications.  Power output depends on the reader medium being utilized.  For example a Mustang Dyno without manipulation will generally be the numbers I use to reference power output.  These numbers are 16% lower than the local DynoJet numbers (a dyno which cannot be manipulated)  and 24% lower than a local Dynapac.  Regardless of the final horsepower and torque numbers you put down, remember that it’s not the total output that’s as much of a concern as the overall increase in power.  If you want your car to make higher power just multiply the results by the above percentages to get good estimates on what it would do.  And keep in mind, Brake Specific Fuel Consumption and trap speeds will give better insight on what power your car really makes.

SI drive modes


SI drive from Subaru opened up a world of opportunity for tuners.  By introducing calculation into throttle position, we are able to adjust the calculated value to net desired results.  What does this mean for you, the owner?  Here are some features we pack into our SI drive tunes:

  • 3 unique maps per S / I / S#
  • Variable boost based on mode/gear
    • Boost target adjusts
    • WGDC adjusts
    • RPM weighing
  • Throttle ramping per mode
  • All factory protections are left in place

What is Launch Control?

It is a secondary rev limit used below a set vehicle mile per hour.  This allows the car to hold a lower RPM at wide open throttle.  Building boost to deliver more torque from the line.   Most vehicles see around 7-10psi of boost with launch control.

What is Flat Foot Shifting?

Flat foot shifting is leaving the drivers pedal down on a manual vehicle when shifting.  Yes, you leave your foot floored like an automatic while you shift.  When engaged the Flat Foot slowly lowers rpm while keeping boost in the intake manifold.  The effect is the car holds about 1/2 of targeted boost on shift.  Flat Foot Shifting eliminates turbo lag after the initial spool up when used.  Stand alone ECU’s and EcuTek have the ability to change target fueling and timing during flat foot shifting.  This is very useful in protecting the motor.

Stock STi Dyno Output

What does a stock form STi make on our dyno?  Well it ranges, but the average is 215-220 AWHP/AWTQ

Do we install parts

Yes we do!  Contact us to get a quote!

Support Included?

Yes, we warranty tunes for tuning defects.  If your car is lacking proper mechanical preparation this is not part of the coverage.  If you have any questions regarding modification or tuning of a vehicle please feel free to email, call or text message us.

Why flat rate tuning?

Flat rates ensure fair pricing and no priority scheduling for any client over another.  Additionally if there are no set ways to modify a vehicle, flat rates keep pricing simple and easy to understand.

What is Feedback Knock?

It is a type of immediate correction pulled from the Subaru ECU.  A common misconception is that Feedback knock is always detonation or the car running in a dangerous condition.  Many things can cause Feedback Knock.  The most common that we see is a loose heat shields and intercooler brackets.  Since the sensor is simply looking for a specific frequency, all you need is something at that range to trigger it.

You should be aware of feedback knock, and figure out when and where it’s happening.  Often it’s a repeatable condition.  If you have more questions please contact us.  Logs are very beneficial for determining the validity of the knock.

Do I need a fuel pressure regulator?

How would you know?  What would you look for?  Often we get asked at what point do I need to upgrade my regulator, and why.  Well if you have an 08+ STi you more than likely have read into the dreaded “GR Stumble”.  The 08+ STi runs a parallel to series fuel system.  It is when the switch between happens, fuel pressure drops.  This causes is what you feel as a stumble.  Here is an example of a replacement kit on a 08+ STi.  We have used COBB’s fuel pressure differential to monitor and adjust for discrepancies in pressure at the rail.excessive_fuel_pressure_01

Green is Boost

Red if Fuel Pressure

White is injector scale

What we see from this log is the regulator not bypassing enough pressure when fuel pump duty increases.  You see this right before we hit peak torque, or our boost target.  The pressure should scale identical to boost, it shouldn’t spike above the delta in boost pressure.  This tells us the regulator isn’t big enough for our application.  Which, in this example, it’s an older STi style OEM regulator.  We simply swap it out for a larger aftermarket unit, and we are good to go!


Above is an example of a larger upgraded regulator.  If you have any questions on what is needed for your specific application please let us know.  We stock and supply many various aftermarket regulator options.

Wideband O2 Sensor

Wideband Clamp

Above is an example of an exhaust clamp with sensor on a catless vehicle.  This measuring ensures proper fueling.  The placement of the wideband sensor MUST be after the turbo and BEFORE any catalytic converter.

Water Meth Injection

Water/Methanol injection is a system that sprays water, methanol or a mixture of both into the intake tract.  Flow rates will be around 20-25% of total fuel consumption.  Most kits come with a controller to regulate the volume of flow, activation pressure and a disabling fail safe.  A properly set up system has little risk and increases the effective octane from 91 to around 95/96.  The best part is windshield washer fluid is a great pre-mixed form of water/methanol.  Here is a video of a 500+AWHP STI running water methanol injection with a proper fail safe.

Yes water methanol injection can be safe to run, be sure to have everything calibrated correctly!

Wholesale or Multi-tune discounts?

We do offer incentive pricing for both large purchases of work and multi-car discounts.  Please email us with specifics on what you look to purchase and we will get back to you.

But I only Installed xxx part, how much will tuning cost?

Large modifications of a vehicle from a prior tune will result in the flat rate being charged for the next tune.   However if only minor modifications have been done (say you added a new boost controller) then we may be able to tune your vehicle per hour instead.  This will save the client some money.

Is E85 Safe

Yes, it’s an amazing fuel that I wish we had more access to in Utah.  Mapping when calibrated correctly yields race gas gains at pump gas prices.  With advances in ECU understanding cold starts and warm up are no longer an issue.  Many early concerns were regarding the more corrosive nature of the fuel.  However in any of the 2000 or newer vehicles we haven’t had any issues.

How long does tuning take?

Most of the time required depends on the amount of work that the vehicle has done to it.  Vehicles with less modification take less time to finish.  The average is 1.5-2 hours for a full tune.  Dyno tuning adds around and hour to this.

My car had xxx issue, what will my bill be?

We try to eliminate all potential mechanical issues with a good pre-tune inspection.  We bill very fairly, and only charge for the time it actually takes.

How does scheduling work?

You will be contacted within 24 hours of payment to set up a time for your tune.  Depending on the time of year and the current volume of tunes it can take anywhere from 1 day to 3 weeks to get scheduled.  Please email before purchase if your are concerned about scheduling.

What time of the day do we tune?

Evenings generally work best.  Most of the time tunes are set up around 8 pm if the dyno won’t be used.  If the dyno is being used it will all depend on openings and time will vary accordingly.  This is for both heat and noise mitigation.

Are there additional costs?

No.  However if your vehicle has a mechanical issue that cannot be tuned around you will be charged a minimum of $50 and up to the full tune amount.  An example would be a “Boost Leak”.  It takes about an hour to correctly diagnosis the mechanical fault.  The client will be charged $50 (Trip charge) plus $80 (hourly rate) for a total of $130.  Expect to be charged the tune amount for work provided.  If something stops us from completing the tune, a discount may be given at our discretion.

When was FNP Tuned established

Tuning and ECU modification started for us around 2006.  My personal car obsession dates back much longer.  Until 2013 the business thrived without any advertising.  We will never be done learning and continue to grow and learn as a business every day.

What about Refunds?

Refunds for deposits generally are not given.   Refunds will be specific to each situation.  At minimum if your tune is scheduled, and canceled with short notice, expect to forfeit the deposit.  This is done in an effort to keep the schedule lead times down.  The more efficient we can keep the schedule, the longer we can keep our costs low.

FAQ didnt solve your problem?

Here are several ways to contact us

Need Support?

Email or texting works best.  Expect and answer in 24-48 hours.

Any other questions?

Please feel free to contact us with any further questions or if you feel an answer isn’t sufficient in our FAQ.