ISR Performance Intercooler Hotpipe with pre-welded threaded Flange paired with threaded HKS BOV Flange for Nissan SR20DET Swap with S13 Intercooler. This is needed for any intercooler kit. If you do not have the stock steel hotpipe. This pipe is 2.25 inch Aluminum with pre-welded threaded Flange and a threaded HKS BOV Flange.
We built them this way so that if you needed to swap BOVs it's as simple as ordering the correct threaded BOV Flange.