Am i missing something here? To me it looks like the SRT-Muffler is a different layout then the N/A-Muffler. And if i remember correct the SRT has an additional resonator too. So basically: What works for the SRT may not work for the N/A and vice versa.

When you go full throttle both modified N/A mufflers I described above sound different/louder compared to a stock muffler. But the sound isn't as deep and loud as a Magnaflow - and it's certainly not as refined as the Magnaflow catback.