DSM's have different exhaust housings.
I've talked to Hahn in the past, they've supplied us with 20g's, they had a nice setup with a 20g & a 10cm2 housing. With that turbo, spoolup was FAST, and performance was MUCH better than stock. Top end was not as good as with a 14cm2 housing, but still good. Problem was that it still had a bit much of backpressure, and the 12cm2 housing was hard to get. They did have a 12cm2 housing on the shelf at one time... I bought it
Give 'em a call. I'm still all for Garrett based stuff... lots of options, most shops can rebuild 'em easy, and they are upgradeable. For $1500, you can get a PTE downpipe, wastegate, dump, cat & slick turbo. Considering this one won't bolt on for $1500.. I still don't think it's a worthwhile purchase. If they can make it bolt onto a stock turbo for less than that.. it might be worth it for those people who want completely plug n play.. but I think completely plug n play is a bit much to ask for.