Upgrading my Volvo P1800 Exhaust?

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Thinking of upgrading my Volvo P1800 exhaust. The current one on my car doesn’t look like original, and is very rusty. The tail pipe is too short, and burn the stainless steel rear bumper of my car.

I posted my current exhaust to Volvo P1800 FB group, and members there mentioned that mine was not original design.

Very rusty at the middle section. This prompt me to thinking of changing or upgrading the exhaust system to a stainless steel original design.

https://vp-autoparts.com/en/artiklar/exhaust-system-volvo-1800-61-65-2-ss.html

The exhaust diagram is as below: