Will running a rear O2 extender or defouler affect how the vehicle performs?
Yes, we and our Beta testers found that their vehicles performed inconsistently with a defouler present and the ECU also targets a slightly richer AFR under closed-loop conditions. This leads to inconsistent performance and worse fuel economy. It appears that all AP users will need to have the secondary O2 sensor located in the proper location of the exhaust stream in order for our OTS maps to perform properly and consistently. If we update our maps to address these concerns, we will be sure to communicate about these updates.
