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A lot of people throw time and money at something with no real way to know the results of their tinkering.
The only way to truly know how you have changed performance is to have a benchmark DYNO test on the stock machine and subsequent runs to see the changes.
In my experience changing exhaust alone will not have a positive effect on performance, but along with changes in jets, airbox, port polishing, etc. some gain can usually be had. Only you can decided it it's worth the investment in time and money.
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