Question about aftermarket full exhaust

I'm looking at a FMF Racing Factory 4.1 RCT Full System Exhaust for my 2013 kx450f. I'm either going to buy the slip-on and get the header later or I'll just buy the entire system but I need to know if I need a tuner? If so, do I only need it when I change the header? I don't really want to go overboard with spending but I really want to change the stock sound. I'm surprised I went this long without changing anything. Lastly, if I do need the tuner, I was wondering what I should get.



When mine was stock I put the same fmf factory 4.1 w/ mega bomb and it was fine with out reprogramming.

09 yfz450r

09 kx450f

Get the mega bomb its sounds the best and it looks awesome !! [

ImageUploadedByThumper Talk1395470960.078532.jpg

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