Was it worth it, I don't know yet as I'm still prepping my cylinder head and I'm planning to install the T/B when I swap heads. On a stock engine it may not be worth it in terms of power gains, but my engine will be somewhat modded by the time I am done and I expect decent gains in my mid and high end power.

6MM doesn't sound like a lot but keep in mind that is just shy of a 10% increase in diameter. I chose 70mm b/c I had a spare 70mm blade. The blade is quite difficult to fabricate due to the bevel on the sealing edge so having a spare pretty much sealed the deal. As it stands with a 70mm blade there is barely any surface left on the mounting flange to seal it to the intake so I think 70mm is the practical limit for an OE based T/B.

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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