Need some help... I'm building driveshaft style "lakes" headers for my Hemi. I'm going to run cutouts and need to make some plugs for the header part. I don't want to run flat plates with wing nuts so I was thinking of running an expansion plug up in the tubes, just after the cutout pipes so you can't see them. Like these: Simple, right? Nothing fancy. Problem I'm having with these is they're NOT for high temp applictions. +225* F, seems to be about the most they'll take. I know silicone rubber will handle a great deal more than that, but I can't seem to find such an animal out there that would work like the ones in the above picture. Have any of you done something like these? Steve Sellers did something similar that plugs the ends of the pipes. They are SUPER cool! I've been trying to get ahold of him to ask what the materials are, but it's tough to get in touch with him now. Here's his slick little caps, in case you haven't seen them: Anyone have thoughts or experience with plugs that will handle the associated heat of headers? I was thinking these need to handle running temps of around 350 or 400 degrees, maybe more, so they don't get stuck in there when I go to uncork them. Anything you guys know of that's off the shelf would be appreciated. Otherwise I'll have to custom make something. Thanks!