I HAVE ADDED THE UNI ALONG WITH AN E3 SPARK PLUG. DID NOT SEE ANY INCREASED PERFORMANCE WITH EITHER. ALTHOUGH MY BR USED TO START IN 3-5 SECONDS, IT NOW STARTS IN 2-3. I THINK I MAY SEE SOME GAINS IF I COMBINE A MUFFLER. IT IS IN THE WORKS, I JUST HAVE NOT MADE UP MY MIND YET.