I was at the parts store the other day and was able to inspect one of these cat back or full header systems! What a marvel of modern technology a full header exhaust system compacted to about 8 in length. Who would of guessed a chromed small Coffee Can with a resonator would have such a performance impact on sport compact cars? With the convenient one screw universal hookup to the stock exhaust! You get all this for a little over $20. It is impossible not to see how much more of a performance boost this is than the costly replacing the old 2 single exhaust with restrictive muffler common on most older US V8 cars with 2.25/2.5 Duel exhaust with free flowing glass packs or turbo mufflers! While I successfully resisted the temptation to buy one for our Bronco II right then and there, I saw the ultimate in Sport Compact exhaust upgrades, a fart can with speed enhancing LEDs inside it!!! My god the performance applications are endless. No wonder these annoying sounding things are turning up everywhere on Sport Compact Cars like the geo metro and Ares K car. I guess they need those huge wings to keep them on the ground with such unleashed performance!!!