A The best way to view BBK's short-tube header X-shape crossover (PN 1460, $169.99) is installed on the car, where it's more obvious that the catalytic converters are undisturbed in their stock locations. Like the rest of the stock Ford exhaust, this BBK crossover pipe uses 2y<-inch-diameter tubing along with the stock clamps. It's great—Ford just happened to section the exhaust system into the right segments. Fitting the aftermarket parts is a cinch.
A The first of many, the prototype long-tube headers (PN 1633 chrome, $549.99; PN16330 polished ceramic, S649.99; PN 16335 stainless, $799.99) BBK made for the 5.0 were built from 0.065-inch wall thickness, 15/s-inch mild steel tubing. Like most off-the-shelf aftermarket headers, they make no real attempt at equal length, but simply isolating the exhaust pulses with suitably long tubes pays handsome tuning dividends.
► Because the long-tube headers displace the stock catalytic converters, 8BK's long-tube X-pipe (PN 1655, $249.99) mounts a pair of high-flow cats as close as possible to the header ball joint. Furthermore, the long-tube X pipe employs 3-inch-diameter tubing instead of the short-tube version's 23/»-inch pipe.
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