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I've got no resonator in my exhaust set up, with a flowmaster 40 series, no rasp here, just a deep tone (for a four cylinder) It is also the cause of whistling of the exhaust under load if you have a muffler shop put on an aftermarket muffler.

You'll gain a little bit on the upper rpm power too after it is gone. Mine was full of carbon because of all the little holes that are in it to cancel out sounds.
 
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