Evo VIII and IV throttle body shaft seals hold the throttle body shaft in place. Over time, they are prone to cracking, allowing boost to leak through the shaft. This can cause a loss of power and other unpleasant running conditions. 

Blox Racing offers upgraded shaft seals. This is an inexpensive solution for those looking to increase boost or just replace their worn-out seals. 

Sold as a pair. 

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