You're accurate about the assumptions. Understand that the collector should be [[ open up at the tip,]] for the correct wave to return back again to the head. If dumped into an average exhaust method you need an increasing area at the end of the collector that is 4 situations https://trentontgpvv.blog-mall.com/31903195/the-2-minute-rule-for-jdm-toyota-4a-ge