For all the time that shotgun style muffler has existed, no one who took this mod as a basis has made a UVM Map. That's why I decided to make a version that doesn't require UVM Map, now the muffler will always be fully chrome or gray if you play without reflections.
This mod does not add a new muffler, it replaces the red racing muffler model from the magazine. To change/replace a model you only need a 3D editor. But you can just download this mod and get a replacement for the red racing muffler with this oval twin pipe one.
How to install:
0. You need have Mod Loader
1. Copy with replace RacingMuffler.dll and Assets folder to Mod Loader mods folder
My GitHub(source)
My other mods