Beta Header Dyno Results

Beta 390cc Dyno Test

Beta 390cc Dyno Testing

We tested the 22 fabrication header designs on a ’24 Beta 390rs Special Edition. The bike was run in factory condition as a baseline, and then modified using each header with supporting modifications.

  • Full mod list: 22 fabrication headers, FMF Q4 muffler (spark arrestor removed), Beta flashed “open map”, 2t screenless air filter cage, upgraded fuel pressure regulator (not necessary).
  • Both versions show significant gains over factory. Up to 10% in large portions of the curve!
  • “Loop” (yellow lines):large and immediate gains in the low-end that carry strongly in the mid range and continue to redline.
  • “Shorty” (purple lines): again,  large gains immediately compared to factory. While giving a very slight edge to the loop from 5k-6k rpm, the shorty is a true powerhouse. It truly enhances the power delivery in every aspect. 
     
Beta 500cc Header Dyno Test

Beta 500cc Dyno Testing

We tested the 22 Fabrications header designs on a ’23 Beta 500 RRS. The initial test run was not in factory condition. Instead, the baseline was done with the beta “open map”, FMF Q4 muffler, and 2t screenless air cage. The headers were then added for comparison.

  • Both versions show significant gains above the factory header. Nearly 2hp in much of the power curve.
  • “Loop” (red lines): we saw very strong increases in power and torque immediately off- idle, and gains continue to grow through the mid and upper rpm range.
  • “Shorty” (green lines): In similar fashion to the 390, the loop keeps a slight advantage in the low end, but the shorty provides a never ending power supply all the way to the rev limiter.