The 4cly and 6cly turbo diesels tend to all pick up around close to the same power, Anywhere from 20% to 60% at certain rpms, But you can pretty much bet you will not see less than 20% more power, You would use a DO5 nozzle and this would give you a good bump in power plus lower EGT's.
You do have a tight engine bay so trunk mounting the kit would be a good ideal
You can either do a universal stage 2 kit with the 2.5 bar controller or a universal stage 1 kit.
Is this your engine?