Just replaced a broken exhaust Flex pipe

Hello,

Did this just happened all of a sudden and did not have any symptoms before?

If the vehicle has very little power and unable to shift to higher gears, it could be due to the vehicle is in limp mode/low power mode.

There could be several factors of why the vehicle can go to limp mode.
Please have a look at these articles for some helpful information:

https://www.2carpros.com/articles/reduced-power-limp-mode
https://www.2carpros.com/articles/engine-has-low-power-output

Typically with the limp mode the vehicle will have sluggish acceleration and could also make it difficult for the transmission to shift.

Many times when the vehicle is in low power mode, the check engine light gets illuminated. Is your check engine light on?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please let me know of any questions.
Thank you.