Is there any difference in the bolt up ability between the two turbos? Are they completely interchangeable? And were is the best place to find a KKK. I have heard the KKK's spool a bit faster. Is it significant enough for me to wait to find one or go get a readily available Garrett for $100.

Your input is needed and very appreciated!

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Regards,
Ian White

1995 E300 Diesel w124 OM606
2014 E550 w212 M278 biturbo

2001 BMW 740i E38 M62 (past)
1981 300SD w126 OM617 (past)