Air/ Fuel ratio was on the safe side
I am currently running a full exhaust and a catted high flow downpipe on my Supra with a stock tune
If anything on a stock tune with a DP, car is reaching optimum boost levels much easier
Our ECU's are very intelligent and adapt well to basic bolt on's
On my previous F80 M3
I ran a stage 1 tune on my car with full bolt ons, tuner just added the CEL delete option for the DP's
It was around 20whp less than the typical pump gas stage 2 tunes and was very reliable
Why not do something similar?
ME spec have spare tires in the trunk
Removed it first day since trunk space was down to nothing
If it does happen I would happily wait for roadside assistance