In Boost Performance

In Boost Performance Subaru Performance shop with Dyno Tuning by TheBoostCreep LTD. We offer parts, installation, and tuning all in one location.

Performance Specialty Shop for Subaru, Mitsubishi, Porsche, and Nissan offering turbo upgrades, fuel system support, standalone engine management, dyno tuning, and engine upgrades. We're a Certified Engine Installer for IAG Performance, and we carry parts from Cobb Tuning, IAG Performance, Extreme Turbo Systems, Radium Engineering, Injector Dynamics, Haltech ECU, AEM Electronics, AEM Intakes, and more.

09/25/2026

Garrett’s 2020 STi is making awesome power with Cobb Flex Fuel and the Turbo Dynamics MDX555-400.

09/18/2026

Our customer is selling his STi! We finished this build last year, it has an IAG 950 long block with ETS rotated GTX3584 and front mount kit, along with all the supporting mods. It’s freshly tuned and ready for its new home. Let us know if you’re interested in this beautiful 2013 STi and we’ll put you in contact with the owner.

The In Boost shop car was on the dyno today with an IAG 750 long block, rotated GTX3076R Gen 2, ID1700 fuel injectors, R...
08/26/2026

The In Boost shop car was on the dyno today with an IAG 750 long block, rotated GTX3076R Gen 2, ID1700 fuel injectors, Radium fuel surge tank, and Haltech Elite ECU. This is at 24PSI, but I think we’re going to turn it up a little in a month or two.

07/28/2026

Derek’s STi swapped Impreza just got a new Link ECU and Haltech dash, along with a tune for Flex Fuel by TheBoostCreep. That’s pretty dang good for a Cobb 20G turbo! COBB Tuning Link ECU Haltech

07/23/2026

Look at all that torque! We added Cobb Flex Fuel to this 2014 GT-R with Injector Dynamics ID1050x fuel injectors and had TheBoostCreep tune it on E85 for big gains, this car is a beast! COBB Tuning TheBoostCreep Ltd.

02/07/2026

Sam’s car got a new engine and turbo a little while back, and we just updated to the fuel system with a radiumengineering fuel pump hanger and bigger fuel pump. This car spools so early and makes great power, while still passing emissions testing. It’s the perfect street car!

We have this Hill Country Garrett G30-770 in stock right now! This is a stock location turbo for EJ Subarus. We haven’t ...
02/02/2026

We have this Hill Country Garrett G30-770 in stock right now! This is a stock location turbo for EJ Subarus. We haven’t tried this turbo yet but we have high hopes. Hit us up if you want to be the first to find out what it’s capable of, it’s priced at $1550 and we can install it and tune in house at TheBoostCreep Ltd.

We are now a Valvetronic dealer! Hit us up for these awesome exhausts
01/29/2026

We are now a Valvetronic dealer! Hit us up for these awesome exhausts

Finally! Cobb has the best solutions!
11/12/2025

Finally! Cobb has the best solutions!

10/28/2025

Another difficult built car needed emissions help. This is not some weird emissions tune result. This is perfect tuning, proper emissions equipment installed, some custom help in the form of thermal management, as well as some very cool new spark plug technology. These projects are difficult but I love a good challenge.

I am here to help keep your car on the road and keep the exhaust nice and clean!

Address

245 3rd Avenue
Longmont, CO
80501

Opening Hours

Monday 10am - 6pm
Tuesday 10am - 6pm
Wednesday 10am - 6pm
Thursday 10am - 6pm
Friday 10am - 6pm

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