I can't answer your question exactly, but I can tell you this. Gutting the cat helps with heat. It will absolutely not make it sound like a 103. Nothing will. I have tried, and tried, and tried again. I'm embarrassed by the money I've spent looking for that sound. The M8 just won't sound like a 103.
I've got a gutted pipe and TABs with the Zombie baffles, S&S ac, and a FP3. It's the best sound I've found. But it ain't no 103.
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11" Road6 bars. Hell's Foundry hidden fairing supports. Bad Dad bags. S&S air Stealth air cleaner. FP3. Custom Dynamics lights. Memphis Shades windshield. Decatted head pipe. Tab Slipons w/Zombie baffles. B52 w/ ARC 602's