You can bypass the steel one with a flexible one .
Some of the steel ones can't be removed . had that same thing on my 453 , my 843 has one routed around the front of the motor .
I agree with Tazza , these are a little underpowered .
Wouldn't be to hard to add a small eBay turbo , they seem to run a little rich anyways . If its not puking light colored smoke out of the tailpipe , might have some life in it .
www.parts4engines.com/perkins-4-154-200-series-engine-overhaul-kit/
Looks pretty inexpensive , actuality came down in price this year ?
I have the same machine .
Hardest part will be pulling it out of the bobcat .