Quote:
Originally Posted by 2009nj335i
Stage 3 is a lpfp upgrade. It uses the factory pump and runs a secondary Walbro that's fired by a Hobbs switch. Hobbs switch goes in the meth bung of the charge pipe and activates at 4 psi. I've had this upgrade in my m2 for a couple months and it's been amazing.
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Interesting! I thought my only option was to upgrade the HPFP. So the stock charge pipe needs to be replaced or is there a bung in the stock one?