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last pic i saw of vadim's xpipe was that it was way too restrictive (total pipe diameter) compared to other xpipes or straight pipes. would make sense that you'll gain a little bit on the low end but lose a TON on the higher end.
The reverse is true for those little japanese imports that put on larger exhausts. they may gain a couple of HP on the higher end but typically lose several HP in the more 'useable' low-mid range. You might have just done the reverse of what those numnuts oftentimes do.
if you're looking for a technical description, i'd go along the lines of added backpressure helping low-end, and choking the high end when it really needs to breath. as mentioned above, the pulsing could be adding to the jacked-upness
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