The Xforce will only fit the 1.6T. A custom exhaust will probably be your best option.

 

It's not just the rear lower bumper panel that is different - the rear suspension on the GT is independent arms, while the rear suspension on LXS, EX, S, and GT-Line models have a solid rear axle. The trunk floor is also different (where the spare tire sits) - to allow for the independent rear suspension on the GT. The exhaust pipe routing is different. Because of this the available GT exhausts will not fit on the non-GT models.

If you were to install the lower panel from a GT on your LXS you would have to get an exhaust shop to fabricate a dual-outlet exhaust. I don't know of anyone who has tried this.

 

Is it possible if I just change the rear valance and go to the shop to get a custom exhaust?

 

Exhaust comparison (2021) - 2022 pictures not available yet:

I haven't crawled around a LXS model to know if an exhaust shop could do it. I recommend you take your car to an exhaust shop and have them take a look to get their opinion on feasibility.

 

Is there a single exit rear valance? Cause for the Lxs models it’s covered and no exhaust exit. The exhaust is just pointing downwards.