Known as a "mufflerectomy" does quite well for performance on VAG PD diesels. Not sure about Rovers.
Can I ask the OP a question ?
If you own a rover and you find it terribly unreliable, why do you then go out and buy not only another rover, but a diesel one ? MG arent known (as far as i know) for making great diesel engines.
Quite the opposite - I got rid of the Rover as it was a little too much in terms of parts - it liked to eat gearboxes for fun, things were dropping off, and although immensely fun in a straight line the handling wasn't ever 100%. It wasn't ever ridiculously unreliable, but I need something 100% to get me to work every day.
The L series diesel as used in the 200/400/600 and the 25/45/ZR/ZS (Although 2 different versions, but essentially the same) are incredibly reliable units, and can easily be tweaked for more power.
The only known issue with them that reoccurs at a noticeable rate is fuel pump failure, but that's because it uses the Bosch VP37 (older engines) or VP30 (newer engines, essentially a more electronic version of the VP37) pump, and both aren't exactly unreliable, but as the miles mount up solenoids can fail.
No headgasket failures have ever been reported on a well maintained, less than 170bhp engine, and the record for miles on the L series currently stands at 1,400,000km on a 600SLDi taxi in Estonia (I think?)
Very unreliable
Edit: In what way did you mean 'not great'? They aren't exactly advanced - direct injection with drive by wire, but this is probably the reason they last so long. Commonrail for the lose!
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