I've done a boatload of mods while making my wagon what I want it to be. My top 3 would be the super lightweight 16" CLK wheels, updating the crappy belt tensioner to the later 104 style, and of course the custom turbo install.

The very first test drive with the initial turbo setup was VERY satisfying. With just a short dump pipe on the turbo, the exhaust snarl mixed with turbo whine was extremely exhilirating. However the MOST satisfying work was building and installing the 2nd turbo engine. A LOT of planning, blood, sweat, tears, pain, work, and time was spent building the current engine.

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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