I fitted a new exhaust to my car yesterday. The old one was 3 ½ years old and was from Eternal. It had been really very good, nice and quiet with none of the booming you get from other pattern exhausts. The joint between the back box and one of the pipes had rotted through but otherwise the rest of the exhaust was still in pretty good shape. Eternal don’t supply these any more so my new one was from eBay, cost £91 delivered from Poland and when it arrived it was obvious it was by the same manufacturer so I was quite pleased.
Out of curiosity I decided to get my angle grinder out to cut up the old exhaust and find out what is inside those boxes.
First the back box. Exhaust gases go left to right. It was much harder to cut through the steel case which was double skinned and about 5mm thick than I expected. Wadding was in both ends and you can see the baffle pipes sticking into the box which are the pipes with holes drilled in them.
Next the middle box. Exhaust gases go left to right. Once again, it took a determined effort to get into this box and it was much harder to cut through than I expected. Double skinned steel again and about 5mm thick. Lifting the outer double skin revealed a layer of wadding which I moved out of the way to find the case of an inner chamber. I cut through this which was also 5mm and double skinned to see what was inside.
This pipe baffle you can see below is on the inlet side. It points into free space inside the chamber.
By now I had run out of enthusiasm for cutting another hole in the outlet side but peeking through the hole I had already cut, I could see a straight baffle pipe. So because the inlet and outlet baffle pipes are not aligned, the gases swirl around inside this inner chamber before exiting. There is also more wadding at each end. So now you know!
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Topic: Ever wondered what's inside your exhaust boxes? (Read 5983 times)