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High Flow Check Valves

New! Configure your custom check valve!

LS Swapped
T-Shirts

Get yours for just $19.99!

Windage Trays!

Fits up to 4" Stroke LS Engines

Prevent Overcooling!

6L, 8L, 10L Transmission Thermostat

Free Shipping
On USA orders of $49
or more!
365-Day Returns
30-day money back and 365-day
exchanges for store credit.
Lifetime Warranty
Improved Racing brand products are
backed by a Lifetime Warranty

Top Products
  1. Improved Racing Low Profile Remote Oil Filter Takeoff Adapter
    Low Profile Remote Oil Filter Take-Off Adapter

    From $138.90

    To $223.70

    Rating:
    100% of 100
    5 Reviews Add Your Review
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  2. Remote Engine & Transmission Oil Filter Mount with Thermostat
    Remote Engine & Transmission Oil Filter Mount with Thermostat

    From $299.00

    To $344.50

    Rating:
    100% of 100
    7 Reviews Add Your Review
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  3. High-Flow Engine & Transmission Oil Cooler Thermostat
    High-Flow Engine & Transmission Oil Cooler Thermostat

    From $189.00

    To $224.60

    Rating:
    100% of 100
    13 Reviews Add Your Review
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  4. 2005-2013 C6 Z06/Z51 Corvette Oil Thermostat Upgrade
    2005-2013 C6 Z06/Z51 Corvette Oil Thermostat Upgrade
    As low as $379.00
    Rating:
    100% of 100
    4 Reviews Add Your Review
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  5. 6L, 8L & 10L Transmission Cooler Adapter with Thermostat
    6L, 8L & 10L Automatic Transmission Cooler Adapter with Thermostat

    From $199.00

    To $234.80

    Rating:
    100% of 100
    4 Reviews Add Your Review
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  6. C7 Corvette LT1, LT4, LT5 Oil Cooler Adapter with Thermostat
    C7 Corvette LT1, LT4, LT5 Oil Cooler Adapter with Thermostat

    From $219.00

    To $262.67

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  7. LS Engine Oil Pump Pickup Tube Brace / Clamp
    LS Engine Oil Pump Pickup Tube Brace / Clamp
    $24.00
    Rating:
    96% of 100
    5 Reviews Add Your Review
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  8. VCM OTR Intake Pontiac G8 with Hardware
    VCM OTR Intake for Pontiac G8 w/ Side Panels
    $499.00
    Rating:
    90% of 100
    2 Reviews Add Your Review
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  9. GM Gen III & IV LS Engine Billet Rear Galley Plug "Barbell"
    GM Gen III & IV LS Engine Billet Rear Galley Plug "Barbell"
    $26.90
    Rating:
    100% of 100
    16 Reviews Add Your Review
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  10. Performance Aluminum Windage Tray for LS & Vortec Engines
    Performance Windage Tray for up to 4" Stroke LS Engines
    $149.00
    Rating:
    100% of 100
    2 Reviews Add Your Review
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New Products View More
  1. Complete Oil Pan Swap Kit for LS2 Pontiac GTO Pan # 12599397
    Complete Oil Pan Swap Kit for LS2 Pontiac GTO Pan # 12599397
    $849.00
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  2. Hose Barb to SAE J2044 Female Quick Connect, 45-Degree
    Hose Barb to SAE J2044 Female Quick Connect, 45-Degree

    Starting at $5.90

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  3. Hose Barb to SAE J2044 Female Quick Connect, 90-Degree
    Hose Barb to SAE J2044 Female Quick Connect, 90-Degree

    Starting at $5.90

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  4. Hose Barb to SAE J2044 Female Quick Connect, Straight
    Hose Barb to SAE J2044 Female Quick Connect, Straight

    Starting at $5.90

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  5. Oil Bypass Cover Gasket for LS Engines - GM Part # 12611384 Equivalent
    Oil Bypass Cover Gasket for LS Engines - GM Part # 12611384 Equivalent
    $4.99
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Transmission thermostat is awesome. Service from Improved Racing was great. Quick delivery of a very high quality piece. I ordered a fluid thermostat with -6 fittings for a 10 sec bracket racer. It arrived in 2 days. After installation, my 60ft times, that had varied by 2 hundredths, now only vary by a few thousandths. Temp stays right at 165 as advertised.

Jeff R.

Just wanted to say that you guys are the best place I've called in 2 years for tech support! I work at a performance shop and search parts everyday. Service was excelent thank you!

Billy A.

If you are looking for quality products and people that actually stand behind them you found the right people to deal with!

Randy B.

The years of testing have proved to have some incredible results. 4 hot laps on track with the Turbo FR-S and I couldn't get my oil over 220F. I could not believe my eyes. Coming down from 270-275F at the end of 5 hot laps, to 220F, is just amazing. Also the added capacity is a nice for a little extra insurance in high G cornering.

We had another successful weekend competing in NASA TTU, a 3rd and 2nd place finish.

Gilbert Rossignol

You guys are awesome. I'm really impressed with your customer service and how organized Improved Racing is. Keep up the great work!

Mike Lanza
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