No CEL at all, The MAF is just screwed into a 2"-1" reducer bushing. The bushing is not glued in, it can be popped out if need be. the rest is all glued together. Its all 2" pvc parts cut down as short as I could and still glue a ring of pvc inside. The couplings are just a tiny bit smaller than the intake, the silver connecter is a coreless pipe coupling, it has a rubber sleeve inside that stretches over to fit on the intake. It mounts it hard on the intake, no support needed.