Sport Cats & Deletes are back in stock and ready for immediate shipment. Get some of our World Record Setting parts, with the factory correct inlet flanges. Special pricing with tunes. Email me at stuart@VelocityAP.com for more info.
Do you need a tune with sports cats to keep CELs from popping up?
Interesting question. So far nobody has tested this out to see whether or not it is possible to fit them without tuning for CELs. Certainly we do offer tuning and can support that if necessary.
Having said that, we use an extremely high quality catalyst brick in this application, 5 inches in diameter which is larger than the OEM. This promotes better air flow but also allows a greater surface area for catalytic reaction. While the 200 cells are lower than the OEM 600's, the high precious metals loading and larger diameter & length to some degree counteract this.
So I cannot say for 100% certain whether they would or would not result in a CEL for cat efficiency, but I'm actually quite optimistic that it would be okay. If they did result in a CEL, one could always use an O2 sensor spacer to pull out of the airflow slightly.