Primary or secondary cat-back for the GR Corolla?
The secondary cat-back starts further back and keeps the second catalyst in place, which makes it the road-friendly choice. The primary cat-back starts behind the first catalyst and is the bigger change. One listing asks whether you are pairing it with the OE or a Milltek secondary cat-back, so pick that option to match your car. Resonated systems are quieter with less drone; tips are GT-115s in polished, brushed titanium, burnt titanium or Cerakote black.
GR Corolla sports cat downpipe and valve control
The GR Corolla sports cat downpipe keeps a catalyst but will usually need an ECU remap. The Active Valve Control kit lets you open the valves when you choose. The GR Yaris also uses a 1.6 turbo; see the Milltek GR Yaris range.
Buying GR Corolla parts from Milltek Exhaust Shop
Free UK delivery, worldwide shipping and Klarna or PayPal at checkout. Check the fit with the reg lookup at the top of the page, and ask about fitting at our Stoke-on-Trent workshop.