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Let me help out..
The stock rear section has a rather large helmholtz resonator chamber. This is used to tune out some of the naturally occurring low end frequencies of the S65. That is why when paired to a catless xpipe you are getting a lot more volume but the low end is being cancelled out in these chambers. You'll have to get rid of the stock unit (or do a 2 or 4 pipe alteration). If you want some of the low end muscular noise back without adding too much drone a few options would be a Dinan rear section or an Active Autowerke rear. Both of these also have helmholtz chambers albeit smaller and tuned to be paired with a free flowing catless front section. So you will get a more robust sound without overbearing drone; while still having some melodious tones instead of that dry rasp you're getting now.
Forget the H-pipe. It'll do nothing for you.
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