My TJ has extractors (make sure they are tucked up away - a lot just hang down under the sump asking to be ripped off) and larger exhaust - don't know what brand as it was on it when I bought it - sounds good and I have never lacked power, although haven't driven a stocker in the bush so don't know whether it has improved power or not!
hehehe...I know where you're coming from....you don't notice it that much cos' you leave the noise behind.....but from back there it sounds much sweeter......well...going by the vid anyway..
I've got a side pipe maybe we should try someday......ex-gricey apparently but couldn't prove it
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I wish mine made more 
