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Have these two no name parts from an '03 IS I had. There are no cracks or weld issues, it was always a great header and down pipe. The rear O2 sensor has been moved and rewelded. That same O2 bung has some messed up threads. I can have a new O2 Bung welded in for an extra $15 or $20, or you can run a tap through it so you don't hurt your sensor. I saw a MAJOR torque difference with just these two parts and a stock cat back. Also saw a ~1.3 - 1.5 mpg increase. All I did in my IS was commute.
Only asking $50 for both the header and the down pipe. Don't really want to ship but I have the original boxes if you want to pay for shipping. Also comes with brand new gaskets.