Who would've thought that such a simple and inexpensive part could make such a difference in how your bike performs. I wasn’t a believer until I installed an one of the Boyesen X-Wings on my FI Road Glide. If you check the front page or tech section of our site you’ll see a tech article in installing and dyno-ing an X-Wing. While the dyno charts don’t show huge gains (1.5 hp and 4 lb-ft of torque), I installed one on my RG and was very impressed. It took me less than 30min to install and I was in the road. I instantly noticed a difference, I mean, it wasn’t neck-breaking power, but it was definitely a seat of the pants difference. I especially noticed it in the higher rpm range; there just seem to be power there that wasn’t available before. If anyone has installed one on their bike let me know what you think.