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ummm...not too sure, i have the alta exhaust, and it was a direct bolt on to the stock exhaust manifold. However, w/ my obx header, it doesnt just bolt up to the alta exhaust. I had to weld a straight pipe from the header to the exhaust. (no cat) we cut the part of the cat off where it would bolt up to the alta exhaust, and welded that to the straight pipe. No cat, only b/c we dont testing! Sounds super nice too!
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R53 PS MCS, OBX Header, Alta oval exhaust, MSD ignition pack, Brisk spark plugs, Magnecor spark plug wires, Alta CAI, Alta 15% reduction pulley, H&R springs, Arospeed 17" wheels, Nexen tires, tinted windows, black racing stripes
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