I will be designing an exhaust system for the AMC 258. For performance reasons, I have decided to keep the pipes from the collectors for cylinders (1,2,3) and (4,5,6) separate until I run out of car length where I will then place an X-pipe. This is the best pattern for the given firing order.My question is regarding the X-pipe. It seems to me that I could achieve the same result by plumbing the two pipes into one muffler with one outlet and two inlets rather than running an X-pipe into a muffler with two inlets and two outlets.My second question is regarding catalytic converters. Where is the best place in the exhaust line for them, and would I be best suited using two separate converters for my application?
The best way would be to go to the library,so 20th century, and get book on exhaust design I don't remember names off any I came across but, they get very technical with the most efficient design.
I am not sure ,but i think the catalytic converter needs to be close to the heat source for them to work. why not duel exhaust all the way back?
The converters should be as close to the maximum amount of heat as possible. Always run the X pipe directly after the converters then into a large diameter straight through muffler. Schonefield and Dynatech racing exhaust systems are designed this way - without converters or mufflers of course.
