I know all three are supposed to work well together. What I don't understand is the math behind the system. For example, I have 4 different styles of exhaust and I change them about every other month or so just to do something different. I have two types of stingers, a hide out muffler, and dual quiet packs. During my carb saga, I had left on the hide out muffler. When everything was done with my carbs, I had the engine running very well with one exception. While driving on the military base, most of the roads I drive down have a speed limit of 25mph. I usually cruised that speed in 2nd gear. After I got my carb issue worked out, my car would "buck" while doing that. When I got to the end of the cruise, either via a stop sign or an increase in speed, my car would sound like I was shooting a deer. I fixed that by shifting to 3rd and the problem went away. I never really thought much about it again since that was the only hiccup I had. I recently changed the hide out muffler to dual quiet packs. Did not open the hood and touch anything. With the dual quiet packs on, my car pops a little while idling, but I can drive it at 25mph in 2nd gear with no problems and definitely no shotgun blasts. My question, how are the three related? What is the math to figure out the best setup?
72 Super Beetle