KW Update and Refurbishing Service for our S13 Drift Grip Project Car!

Then it is deburred on an Apex Grinder.

Here is the end of the shaft and the part of the adjuster that the knob fits onto.

Next, it is time to install the high-speed blow-off valve and the piston.  The one-way check valve is fitted to the shaft.

Next, the piston is fitted to the shaft and the valve stack for the rebound high-speed blow-off is installed.  First, the base shim is put down.


  1. What’s always interesting is seeing how different KW’s valve design philosophy is compared to the Bilstein/Ohlins/Penske/etc deflective disc pistons… but obviously it works, and works well. Cool that they’re doing rebuilds in-country too, thank you for sharing all of this.

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