Yesterday soaked the engine down with Gunk,ran to local car was and pressure washed a long while.I was able to clean most of the undercoating off the inner fenders.So its possible.I hate the look of the stock exhaust manifolds with the heat sheilds left on.So I removed the right side.Knocked the sheild off.Which made for one problem,the spark plug wire heat sheild.So I made a couple of brackets to install the sheild.I also removed the heat flap and actuator.I couldn't believe it,the 10mm bolt holding it to the manifold backed out with a 1/4 in drive ratchet.Pluggged the hole with a 3/8 bolt and some high temp sealer.