Okay BMW folks, listen up. If you're getting codes for vacuum leaks or rough idle, your intake manifold gaskets might be toast. This is a complete upper and lower intake manifold gasket set designed to replace OEM part numbers 11611436631, 21006001071, and others. It's made from high-grade silicone, which means it seals really well against heat and pressure, and it should last. The fit is for a bunch of BMW models from around 1999 to 2006 – we're talking 3 Series (323i, 325i, 328i, 330i), 5 Series (525i, 528i, 530i), X3, X5, and even the Z3 and Z4 roadsters. Seriously, check the crazy long list in the description to be sure it matches your exact year and model. A good seal here means your engine breathes better, which can actually help with power and maybe even save a little gas. Installation is a bit of a job, so you'll need some mechanical skills or a trusted mechanic. Each set is inspected before shipping. Double, triple-check your OEM number and car details before clicking buy to avoid the wrong part showing up at your door.