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What changes in sound from changing to a hi-flow cat?
I have very little experience with small engine exhaust systems. I'm looking at replacing parts of mine. Specifically the secondary cat gets replaced with a hi-flow unit and everything after gets replaced also. The problem is that the only guy in the area with the same exhaust did not replace his cat.
If I listen to his system, other than the obvious volume level differences, what other differences should I expect from the different cat?
Will "drone" level change?
What about "rasp", although I freely admit I'm not 100% clear on exactly what this sound is in an exhaust?
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