Hyperflow 2001-2007 WRX/STI downpipe with high flow catalytic converter uses a massive cast 304 Stainless Steel Bellmouth that tapers to 3.0 inch piping where it connects to the mid-pipe. Unlike previous designs, the new downpipe will bolt to any stock or 3 inch aftermarket catback exhaust system.
- Two-piece design:
- Reduced shipping costs
- Delete the catalytic converter without having to buy a whole new downpipe (Catless Race Pipe sold separately)
- Easier installation
- Cast 304 Stainless Steel Bellmouth upper section for maximum exhaust gas flow
- 3.5 inch diameter 304 Stainless Steel pipe tapering smoothly to 3.0 inch
- Spare wideband oxygen sensor bung included
- Modified pipe path to provide more ground clearance for lowered cars than previous design
- Hand TIG welded polished to a show quality finish
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