GSXR makes some good points. Before hanging my turbo, I think I had one of the best breathing N/A 103s around. I doubt it would have hit your target numbers. Despite all of the breathing mods I had done, it still had to breathe through a stock set of manifolds. I just don't think they are up to the task in N/A form. What I'd really like to see is a nice tuned length header on a 103 engine. The only problem then is that you would shortly be at the limits of the intake manifold. You can go a little bigger on the T/B but runner diameter isn't easily changed.

A nice tuned header, an extrude honed intake, a well prepped head... I believe could make some very respectable numbers. The economics of making that happen though preclude most from ever attempting it. For similar or less cash, one can get boost.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff