Best first mod to my XR 70 ????

[spankylowe]

I just bought an XR70 for the hell of it and I'm already wanting to make it faster and am wondering what mod would be good for starters ????
I'm thinking of an exhaust but I'm sure what my options are,,any help would be great...
Thoughts?????? comments????

 

[xr100ider]

if you were thinkin exhaust, fmf just down sized their power core for the little bikes. u also might want to try a smaller sprocket--maybe 1 or 2 less teeth. but i'm not sure how you're bike will handle the extra load.