depends on which one you have, normally you have 2 ports at the top, rear one goes to cam cover (cover needs to be drilled and a fitting welded in), front one goes to original breather outlet(with one way valve removed), return goes round back of engine and into sump(there is a blanking plug at the bottom of the block on the exhaust side which will need removing and a fitting which should have been supplied with the kit put in). The large port underneith just goes to atmosphere via a hose to the bottom of the car. Hope this helps