Hey guys I am going from a vance ad hines 2-1 to a thunder header on my FXDX I already have stage one and mukini carb will i need to rejet it???

 

No. I have a fuel injected '07 with Stage 1 and went from stock headers with SE slip-ons to a 2-1 Thunderheader and all's good.

 

You shouldn't have to re-jet your carb, as the back pressure for the two exhaust systems are similar.

 

thank you guys so much for the help! What are the general how to tells if i am running lean or rich?? if ya couldnt tell carbs are new to me lol.

 

I am not experienced with the Mikuni carb but as a general rule if the engine backfires, pops or spits through the air cleaner this indicates a lean condition and the intermediate jet should be larger. Backfiring through the exhaust indicates a rich condition. Stumbling or burbling or feeling sluggish on acceleration probably means the main jet needs to be leaner. My limited knowledge is based or running S&S carbs. If you think you have a problem see if you can get an instruction manual from Mikuni.

I doubt if you will have these problems resulting from just this exhaust change. Good luck.

 

Check your plugs; white = lean - black = rich - light brown = just right

 

Thunder headers are loud, Like hurt your head loud

 

But they sound soooo good!

 

Wanna sell your old pipe? If so what year is your bike and do you have pics?

 

No they are not. Thry have a nice deep sound unlike some of those obnoxious drag pipes.
Have you ever heard Thunderheaders?