If you can tell me any of them or point me in the direction of a site that gives similar information other than wikipedia i'd appreciate it
Sounds Exhausting to me! High flow cat converter?= Higher than stock converter exhaust flow. Cat back system Is a complete exhaust system behind the stock cat (legal) that will either be true dual two pipes front to back or single pipe. Y pipe is for single to dual or dual to single tube. X pipe smooths out the exhaust pulses by blending pulses from both sides. Test pipes are cat converter eliminators (Illegal) but some time necessary in order to make the 5 gas testing equipment work at the Dynometer shop to adjust the fuel and timing tables. Down Pipe generally is from the manifold to first connection or turbo outlet. Resonators is a tube/muffler to silence some undesirable noise. Mid pipe is in the middle? There are many manufactures of exhaust equiptment if I knew what the make and model engine size car your working on? Good Luck
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