XR100 Performance Exhaust

What aftermarket exhaust increases the performance of an XR100 the most? I was thinking Big Gun EVO? BBR?

I should be recieving my BBR this week. Ill tell you how it runs and sounds.

I use a white bros. r4 on my daughters xr80. cant remember how much improvement but it made a diference over stock and has a real deep throaty sound to it but not to loud. there is a guy on ebay selling them for $179 w/free shipping. keyword white xr100 and it should pull up.

Well got the BBR on today, Fit perfectly and sounds great. Rejetted the carb and runs smoothly. Only ran it for a few minutes tho but it seems to have more power everywhere.

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