HyperFlow - Down Pipe with Cat - WRX/STi (01-07)

Hyperflow 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.

Features Include:

• Two-piece design:
  • 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