Actually it probably wasn't customised. That is how they were made. The two sides go together right at the cat converter. There is a four bolt flange at the interface between the crossover pipes and the cat.
Catalytic converters contain something called platinum or rhodium or palladium flakes. Here is a quote from the Related Link: "Catalytic converter -- an integral part of vehicle emission control systems since 1975. Oxidizing converters remove hydrocarbons and carbon monoxide (CO) from exhaust gases, while reducing converters control nitrogen oxide (NOx) emissions. Both use noble metal (platinum, palladium or rhodium) catalysts that can be 'poisoned' by lead compounds in the fuel or lubricant."
I don't know about the catalytic converter (typically Rangers -at least the 4.0L V6 has 2 catalytic converters). But for the rest of the exhaust system : with 2 prebend pipes, gaskets and the muffler, you are looking at anywhere from $ 361 to $ 457.00 as of Dec 15, 2011. - it also depends on the shop who does the work. Hope this helps.
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