Guys I've tried the boost bottles on 2 of my bikes and I've decided they are not worth the trouble of installing. I've made them in different sizes and shapes and made an adjustable one. I'm through using them and I've welded shut the hole in the manifold on one of my engines and plugged the other one. I'm off the bottle for me. I'm not trying to talk anyone of you out of trying these but if you decide in the end you don't like them you will have to seal the hole up with something or buy a different intake manifold. I made my own so the cost was just my time.
Norman

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norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out