Gen6 Camaro Sound Tube Removal (V6 and V8 versions) and door rattle notes

--NEW-- Per feedback on the gen6 Camaro forum, I have created versions of an intake tube plug that will fit V8-engined cars. Presented here are versions with and without the Chevrolet bowtie on their faces. The version that has an o-ring groove is designed for a standard "116" size o-ring (15/16" OD, 3/4" ID, 3/32" cross section). All versions should be RTV'd in place to make a good air seal. These were tested and confirmed to fit by the kind courtesy of Sean B. (@Texan.1LE) who also provided the photos of printed plugs and a V8 installation. Please note that the V6 versions are for 30mm intake tube holes and the V8 versions are for 24mm holes. The firewall plug works for both V6 and V8 cars. ----------------------------------- There are also a couple of alternate versions of my Gen6 Camaro V6 sound tube removal plug set (the original versions are at- https://www.thingiverse.com/thing:3127222). They are intended to improve upon the originals while being even simpler to install and much less expensive because no purchase of a rubber plug is needed. There is a video that concerns what to do it you suddenly notice rattles and road noise because it is now much quieter inside (see below). :-) Also- I recently learned that apparently there is a GM firewall block off plug, part number 23342796, originally meant for 2.0t applications. You may wish to purchase one of these rather than printing one such as mine. However because it typically sells for around $18 (plus shipping) I would still print my own if I had to do it again. My design also has more robust lock tabs than the GM version and a solid center. Curiously they call it an "front intake air duct hole" cover when in actual practice no air should ever be passing through that opening at all. Differences from the originals- 1) This firewall plug is solid (no center core) so it can be printed with a relatively low percentage of infill and still not need to be sealed. 2) The original set required the purchase of a rubber plug. These versions have custom made plug sets that seal from both the inside and the outside of the intake pipe. This puts less stress on the pipe while being even more hidden from the outside. 3) The seal onto the intake pipe is now merely a bead of silicone RTV around the plug flanges as shown. New version of the firewall plug- (V6 and V8) You will still need to put some 1/8" thick closed cell foam on the firewall plug, but that can be made up of strips if you wish. I cut a gasket from 2" wide 1/8" thick "Frost King" seal tape as shown in the photos. It works like a charm and that material is handy to have around for chasing rattles anyway. I also added a 5/16" fender washer to spread the load of the clamp nut more evenly. Again, this firewall plug will fit both V6 and V8 cars. Version 1 of the V6 pipe plugs- (30mm intake tube hole) The intake pipe plugs are fastened together with M3x35mm screws, but you can also use 6-32x1-3/8 screws or even drywall screws. Just ream out the through holes in the bottom plug half to be a slip fit over whatever screws you use. It is suggested that you use small washers on the screw heads to keep them from digging into the plastic. Don't over-tighten them of course (because it's only metal threading into plastic), and there is no need anyway. The upper plug inside the pipe may be a tight fit because the pipe shrinks a little where it is fastened to the main intake body. If in doubt, scale both plug halves at perhaps 98% in your slicer. They will still fit extremely well. Be sure to fillet the edges of the plugs with a bead of silicone RTV (see arrows in photo) to act as an air seal and just wipe off the excess after installation. I used three screws in the design so that no single point of failure would allow anything to be ingested into the engine. Version 2 of the V6 pipe plugs- (30mm intake tube hole) This pair of plugs for the intake tube thread together without requiring any other hardware. They will need to have their flanges filleted with silicone RTV to make a good seal like the other ones, then wipe off any excess after assembly. The nice thing about these is that you don't need to thread them very tightly to grip and hold. I made them a bit looser fit in the intake pipe tube and they are the ones that I am leaving in my car permanently. Print these with 50%-70% fill so that they are strong. Update While doing some other work on my car last weekend (02/01/2020) I checked on these plugs and they had not loosened even in the slightest after many months of being in place. So this design works very well and remains quite secure. All versions of V8 pipe plugs- (24mm intake tube hole) All the variants of the V8 intake tube plugs posted here are installed from the exterior of the tube. You may want to trim off the little anti-rotation tab on the tube so they will seat closer to the tube, but it is not required. Be sure to use plenty of silicone RTV to make an