Eli is the best.....
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that resonant sound can be eliminated by:
1. add resonators. the longer the better, close to the headers.
2. add an x pipe to equalize the 2 bank pulses out back.
3. 6 into 1 headers into single exhaust pipe.
Although it is an inline 6 engine they still separate the banks so each side of the exhaust is a 3 cylinder engine all the way back to the muffler. Add an exhaust to a 1.0L 3 cylinder geo metro, put 2 of them side by side and most likely you will get the sound that the ZHP puts out with headers and twin pipe exhaust.
The 7M-GTE supras had a 83mm bore and the exhaust note was still deeper, way deeper. The exhaust pulses went out a single pipe.