Made from the highest quality hardened steel on a UK £1 million computerised machine, this restrictor bolt will reduce oil pressure for the engine turbo solving the problem of oil seal leakage on the Z20LET & Z20LEH engine.  

As standard without the restirctor, the oil pressure is too great for the turbo seals resulting in oil leakage, which in turn leads to undesirable smoking on idle. The restrictor bolt solves the smoking, and also prolongs the life of the turbo.

These restrictor bolts are designed to restrict the oil pressure build up in the turbo core whilst maintaining sufficient  flow to keep the internals well lubricated. Please don't confuse them with many others which claim to be restrictor bolts but have oversize or incorrect sized holes in them   

Supplied within this kit is: 

Oil Feed Restrictor Bolt & two Copper Washers