Elise SC 2ZZ-GE Re-Packable Race Exhaust
A very popular car for Track/Race use. Any track/race supercharged exhaust will need to be re-packed if you want to meet the strict noise-limits on UK (and other!) circuits.
The cheap/rigid exhaust mounts place a huge load on the hanger brackets, so I've moved them to a saddle-clamp layout. These have an in-built flexibility to isolate the system from excessive engine/transmission movements.
The silencer body itself is made from 0.8mm thick stainless steel. The inlet end-cap experiences the most stress, so the silencer is double-skinned at that point and the end-cap welded in place.
The removable outlet end-cap is a 2bular pressing with a tapered flange to ensure a good seal once it's pushed home. I now use stainless pop-rivets to hold the end-cap - quick/easy to replace - threaded fasteners tend to gall (seize) when exposed to exhaust heat.
I use the double-skinned inlet end plus another baffle-plate to form a Helmholtz resonance chamber (H1 version). This drops the noise-level another 5dbs approx. It takes 2.5 x more man-hours to build and uses 46 separate parts compared to 24 for the Road version. It's a real PITA to fabricate/weld but it works very well.
The Thru-Diffuser pipework is removable to make the re-pack task easier - held with a very secure V-band connector. All-in-all, a very high-quality race exhaust system.