Disclaimer: I am not an expert in regards to exhaust theory, design, or even installation for that matter. Exhaust is a very complex part of total engine design and there are many well written books that deal specifically with this subject. One in particular that I highly recommend for folks who like to dig into advanced theoretical writings is: Scientific Design of Exhaust and Intake Systems by Philip Smith and John Morrison, 3rd Edition. Don’t let the 1972 publication date fool you. It is theory and physics and they do not change with age.
