05/15/2026
Lots of People Say, “Just Go Catless.”
Here’s what actually happens:
•Post-cat O2 sensor immediately reads zero catalyst efficiency → P0420 code → CEL on.
•Removing the cat drops turbine back-pressure → your wastegate loses authority → boost overshoots → your OTS tune is no longer calibrated for your setup.
•O2 sensors run hotter and work harder without the thermal buffer of the cat → accelerated wear.
•Without a custom tune that disables O2 monitoring, you’re fighting the car every time you drive it.
•Fails OBD emissions inspection in most states.
The real-world HP gap between a properly spec’d G-Sport high-flow cat and catless? Roughly 5–10hp at most, depending on platform, often within dyno margin of error.
G-Sport GEN2 at 400 CPSI gives your ECU exactly what it needs, keeps your OTS tune stable, and is rated to 1,200hp. Performance without the compromises nobody warned you about.
