Honestly, for pumps I would go with either Denso, or Bosch. Both are OEM quality pumps. Walbros are not. They have a much higer rate of failure then either of the other two (which is also why they're cheaper).
044 is a nice pump, and if properly isolated, is not noisy at all (they use them in...
I had a GT40-88 on a 1JZ, which is about the same size.......
....if you want power after 4500, go right ahead, but personally, I would say it's a little too big for a 2.5L. 3L it's good though :)
I just don't like the idea of passing a nitrous charge through a manifold designed for an air charge. Call me crazy, but I'm paranoid about even distribution of the nitrous charge.
So I've been randomly toying with this idea for a few days now.....
...I was thinking it would be fun to install a dry nitrous nozzle into each intake runner, and have it completely controlled by the ECU. Around say 2K, the ECU turns on the nitrous, then overlays a fuel map to add enough...
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