On the turbocharged GR Corolla, the downpipe sits directly after the turbocharger, so it usually has more effect on exhaust flow than any other exhaust part. Our LIMIT+1 GR Corolla High Flow Downpipe + Midpipe w/ EPA Approved GESI Cat keeps a catalytic converter in place, and we recommend pairing it with a custom EcuTek tune.

Behind that, a catback exhaust mainly changes sound and appearance. GR Corolla catback options on our list include Borla, HKS, REMARK, Milltek, Invidia, MagnaFlow and MBRP, and we also carry the AWE GR Corolla exhaust and the DC Sports GR Corolla Triple Exit Exhaust System.

Any change to the exhaust ahead of the rear oxygen sensor can affect what the ECU reads, so the result depends on the downpipe and the tune running with it. Our LIMIT+1 GR Corolla High Flow Downpipe + Midpipe w/ EPA Approved GESI Cat keeps a catalytic converter in place, and we recommend running it with a custom EcuTek tune through LIMIT+1 x Boosted Performance Tuning.

Emissions testing rules vary by state, so check your local requirements before installing any exhaust part. Contact us before ordering if you want to talk through your setup.

Under the Magnuson-Moss Warranty Act, a dealer cannot void an entire factory warranty simply because aftermarket parts are installed. A specific claim can still be denied if a modification is determined to have caused the failure, and ECU changes are detectable. Warranty decisions are made by Toyota and its dealers, not by LIMIT+1.

Orders are processed within one to five business days, excluding weekends, holidays, pre-orders, and backordered items. Orders over $199 ship free within the continental United States by ground service, excluding freight items. We also ship to Canada, Australia, and non-continental US destinations, where import duties and taxes are the customer's responsibility.