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I have a fg cat on either side with a 1.2 metre hotdog with perforation, and I just had my first inspection. They produced about 100 db, then I stuffed 5 scourer into the end and it brought it down to 95 db. So Now I am looking for a very small diameter muffler to quieten it down to a legal level.
302 windsor. The engineer went through a lot of jargon about frequencies etc and tuning the exhaust to counteract them. We played with the idea of inserting to tin can into the end with a stiff wire and sliding the can inside the hotdogs whilst it is running until you hit the sweet spot . The test is done running the engine in neutral at 3300 rpm.
JD
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