Most people do not view their exhaust as a maintenance item, but it is, especially if you run the car hard. Packing material can break down (this is accelerated with poor tunes and track use) and the metal can fatigue and crack from heat cycles and vibration. If you are shooting flames from your exhaust, it is only a matter of time before your exhaust breaks and/or your car catches on fire.
Exhausts can break under normal conditions, but when you have a low quality exhaust or a low quality installation, wear and damage can happen relatively quickly. This is important as not only does it make your car sound bad and affect performance but it is a huge safety hazard. Exhaust gasses are HOT. We have seen these cars catch fire from only from two things, fuel related modifications and exhaust system failure.
Case #1: Lotus Elise
|Poor install and repair attempt :(|
Case #2: Lotus Evora
Halloween is quickly approaching but it came early for us here. We found something scary under an Evora we are working on for the first time - it came here from the SouthEast. This car spends most of it's time at the track so it has been stripped of interior and has a cage and race seats installed. It has received some "interesting" work during its life that we are finding and fixing as we go.
One of these interesting things is the 'custom' exhaust and hanger. This car has a muffler delete system with some custom work done to it. It looks like a sheet metal hanger originally was fixed to a rivet nut in the subframe but that rivet nut loosened up. The previous shop's solution was to stick a bracket from a safety harness in one of the holes of the subframe and tie the exhaust to that with some bailing wire. We do not recommend this as a way to attach anything to any part of your vehicle. This is probably the most ghetto fix we have ever seen! This type of "fix" belongs on a jeep stuck 20 miles out in the woods, not something that will be run on track. I am sure this was meant as a temporary fix, but it was obviously run like this for longer than was necessary.