KKK's have a funny looking wastegate with internal rod garrets are different. i believe you have a garrett t3 could you get another pic? Here is a shot of a KKK. How much do you know about diesel? A 603 is quite fast but fuel is more an issue than boost. Stock boost is around 14 iirc. Not much difference between 13-15psi anything past that just makes excess heat. Reaserch "ip full load adjustment" for real gains.
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