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

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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.

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!

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

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!