Good morning all .keep getting info, dont know who is right .can i do economy remap some say should not as gearbox engine will bw week to much strain , and secondly egr removal all blanks ,some say it will show eml light. i wish to do egr first, full service done and swirl flaps gone,pick sup better but mileage wise 44 on run in town 28 mpg , not worried but wondering if this is correct on 145000 mile bmw 525d 2004 full service history, any thoughts on this ,

Very happy 39,7 mixed driving, egr junk to take off yet and cut out that crappy thing in exhaust

 

Always a good move to remove emission items on the early cars, they never did work properly and were only there for the manufacturers to gain Euro standard emissions (drive-by noise reduction valve on the exhaust is a classic example - replacement exhausts aren't equipped with this component)

I used to work on a lot of American cars from the late 60's and early 70's and they had so much useless junk on them that a 5.7 litre V8 would only produce 210bhp....after we stripped off air injection, early pellet type catalytic converter, restricted inlet manifold, EVAP....and so much more junk to satisfy the Californian emissions rules. After that we were getting a respectable 280bhp output from the engine and the thing would still run incredibly clean on emissions

 

thank you for help, i will find the exhaust part and remove