The most popular ones where the T25 came from are from older Nissan 200SX and I think 2nd gen DSM eclipse/talon turbos. Vortech FMU are cool but the N/A to boost transition sux. Like Pdogg said, there are pros/cons on each. If this is your first turbo set-up, I say get a kit and learn from it. Most kits are dyno tested. Plus, it is really hard to answer that question anyway, since each kit has its own limitaton. You have to consider factors like: HP goals, streetability, street legality, internal build-up, boost level, etc.... peace
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