Re: Want to build a custom exhaust? Read this first!
Before. There's no point to running 2.5" for a really long way back and then going to 2.25" near the end. I would say weld the reducer to the end of the cat.
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2001 Impreza 2.5RS Aspen White - I/E, springs, WRX brakes, OZ Prodrive P1
2003 Tiburon GT Carbon Blue - RIP