I have a new 06 FXSTBI. I plan to keep the stock exhaust for several years.
My question is, how much horsepower/performance will I gain with a Stage 1 kit with the stock exhaust system?

JimBob

 

i think that you gain more from the stg 1 kit than the pipes, but your problem will be. you will still need to get a download or SERT. and if you are going to spend the money to do that you'd be money ahead if you did everything all at once. if you just put the stg 1 kit on you will be to lean and hurt the life of your engine. leave it stock and wait and do the pipes, stg 1, SERT. ALL @ THE SAME TIME...

MY .02 CENT

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What he said.