Many B9 S4s are experiencing an annoying exhaust rattle related to the active exhaust system. Some S4s, like mine, even throw fault codes including P0477, P0475, and P049F showing there is a problem with the valves. This is often caused by a weak or broken spring inside the exhaust door control unit. Interestingly Dodge Charger and Challenger models have the same Küster brand actuators flaps/valves inside their exhaust too. Facing the same issues a newer spring has been made available by Mopar that eliminates the rattle.
exhaust Timeline
ECS Tuning X-Pipe - Audi B9 S4
I've been looking for some options to spice up my S4 exhaust. There are several X-Pipe / resonator delete kits on the market. Today we test out the ECS Tuning B9 S4 3.0T Center X-Pipe kit. I will show you how to perform the installation and we will compare the sound against a stock exhaust. Will this be a horrible mess of drone or will this be an amazingly cheap way to get sound from your S4?
2019 GMC Sierra Borla ProXS Muffler
The 2019-2022+ GMC Sierra and Chevrolet Silverado 6.2L trucks are nearly silent. This is thanks to dual valves that block up way too much of the exhaust in an effort to muffle the V8 roar. I'm going to fix that with a Borla ProXS 40359 muffler. I'll cut off these ridiculous flapper valves (adaptive valves) and make it sound like a nice V8 again! Who wants a V8 with no rumble? Not me! Any reputable muffler shop should be able to help with this fix if you can't DIY it.
