I remember reading somewhere that even without the oil pressure (ASD) the 2.5-16v diff has mechanical locking to some extent (if I remember correctly ~ 18%) .....

Chlippo, that exhaust header will work but it'll not be optimal in my opinion, can't you find one from a TD model to modify like I did ?

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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)