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A note on performance mufflers (archive)
[ Follow Ups ] [ 3-series (E21) Message Board ] [ Msg. Board FAQ ]
Posted by Lance on November 21, 2000 at 19:43:24:

In Reply to: Engine dampener fuel reclamation system questions posted by Tim on November 21, 2000 at 13:18:21:

I used to work on high-performance low-restriction mufflers for Walker Muffler.

First thing to recognize is that the reduced back pressure benefit of a performance exhaust is typically not seen until the high-end of the rpm range, where flow rates are high....in other words, they don't help you much during typical driving.

Many high-performance mufflers are simply glass-packs. The lack of low-frequency noise reduction can rattle fillings.

Your catalytic converter probably is costing you more in terms of back-pressure than the muffler. If you really want a low-restriction exhaust system, start at the catalytc converter. A header system will greatly improve the exhaust efficiency of the engine as well, resulting in an engine that breathes easier.

On a good note, most performance mufflers are stainless steel, and tend to last longer.



Does anyone know anything or have any opinion about the engine dampener on the e21 320i? I believe mine has gone bad, but I'm not sure how much tension it should have to begin with? Should it feel something like a small shock absorber and want to extend on its own? Are they that effective in quieting engine shimmy? Most catalogs list them for about $55 US, but are they worth the time, effort, and money?
Second, the fuel reclamation system. Is there any way to test if it is working? I had a hose that was severed and I don't know how long it was like that. Is there a way to check for clogs? What about the charcoal canister? I believe it is original to the car. Should it be replaced just on general principal? If this system is working properly will it boost my gas mileage?
Finally, I have a question about exhausts. Does anyone have any experience with aftermarket exhausts? I was looking at the ANSA muffler, but I don't know how they sound? I would like to step up the performance a little without sounding like a boy race. Does anyone know the life expectancy of an ANSA muffler?
Any help would be great! Thanks.




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