Review on ATP Automotive Graywerks 106001 Engine Intake Manifold: High-Performance Product for Enhanced Engine Efficiency by Roger Diaz

ATP has a bolt hole on the side of the PCV manifold valve that is not made wide enough so it will tear when tightened and the Felpro gasket will not fit due to this bolt hole. But it's better than Dorman. The Felpro gasket is perfectly aligned with the lower manifold. Unfortunately, it doesn't match the two Dormans and two ATPs we tried. Dorman's gasket did not fit her manifold very well and did not match all of the holes. The ATP gasket fits their manifold much better (the inner holes match!), but the first ATP gasket had a crack in the plastic (not the rubber gasket material) around an inner hole. So really go around each edge and check them out. ATP has a metal bushing in the EGR tube hole in the upper manifold. All brands offer you a smaller EGR tube that you install in the lower manifold. Having this smaller tube in a metal sleeve instead of a plastic hole is an excellent design. The ATP also comes with a plastic straw and gasket installed, so you can see at a glance if the gasket is good enough.