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Affirm Financing

You can buy-now, pay-later, and split your order into monthly payments! Just put together an order, and you'll now see Affirm Financing as a payment option!

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Learn about our new site

We're THRILLED to present to you our new website! We've been working hard to provide you with the most user-friendly experience possible. Read more

Check out our new Blog

Everything from our Project Car, to the Flatirons Tuning Rally Team, to Performance and Tuning posts, we cover it all!

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Flatirons Tuning Video

Did you know that we have our own Youtube channel? We cover everything including installation videos, product reviews, track day events, and much, much more!

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Flatirons Tuning Video Gallery

Featured video

Ever since we made our first two videos about swapping an STI 6-Speed into either the GD WRX (2002 - 2007) or the GR WRX (2008 - 2014), there are a number of common question that we have received. Since we were helping Tasso Koch from OTC Racing put an STI 6-Speed transmission into his Rally car, we decided that this would be the perfect time to revisit some of these topics.

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Latest News From The Shop

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  1. Learn About Our New Site
    Learn About Our New Site

    Hello, and welcome to our new site!

    We've been hard-at-work over the past year upgradin

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  2. What is the difference between Horsepower and Torque?
    What is the difference between Horsepower and Torque?

    If you are thinking about improving your car’s performance by bolting on anything from an i

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  3. CU Rally Event
    CU Rally Event

    Check out the photos from today's CU Rally Event!

    The event was held at the UMC at the Un

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  4. Flatirons Tuning Subaru Track Day
    Flatirons Tuning Subaru Track Day
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  5. Pictures from SEMA 2003 (Part 1)
    Pictures from SEMA 2003 (Part 1)

    These are some pictures from when we attended SEMA in 2003. This year, we will have more pictures

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  6. Crash Pictures!
    Crash Pictures!

    Here are the photos you have all been asking for!

    (Click on the thumbnail to view lar

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