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Reply to "kit speedster exhaust system and muffler"

@dlearl476 posted:

It's a little more complicated than that. A well designed exhaust uses the pulses of one cylinder to draw the spent gases out of another cylinder. Similar to an expansion chamber on a two stroke. But note "well designed exhaust" in italics. I'd take a WAG that 80% of exhausts on the market are just random pipes welded together to fit the space with little or no research into whether they work properly or not. 

^ That. All day long, THAT.

Get a copy of A. Graham Bell's "4-Stroke Performance Tuning". The section on exhaust is worth the price of the book.

It's easy to design a perfect exhaust in a car with the engine in a "traditional" location. Exhaust in a rear-engine car is always going to involve some trade-off. I went down a very extensive OCD rabbit-hole a few years ago, when John Connolly told me, "Stan, there are 3 things that people are looking for with an exhaust: 1)  How well does it fit? 2) How well does it perform? 3)  How does it sound? Just getting something to fit back there is a struggle, getting it to fit and perform acceptably is another thing altogether. Getting it to fit, perform well, and sound good is the holy grail."

Nothing will tick every box, and that's just the nature of the beast. An A1 is the happiest compromise, but it's not perfect.

Last edited by Stan Galat
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