Great poser question ! I've done a few mods, but I haven't done/plan to do anything that isn't easily "unplugged" and returned to original. Wherever possible I've retained the original parts, all packed away for this purpose (even kept the original bulbs). I've also chosen "period" upgrades wherever possible, eg. I've gone for the best period Becker Cascade head unit and modded this to full bluetooth, rather than fitting the new Porsche retro unit. It's going to be down to personal taste and of course the type of use that you have for your car. Personally I drive mine a bit, so I'm interested in minor tweaks to make it more enjoyable, but don't want to do things which detract from the original design, eg. when replacing engine mounts and silencers, I went for std. units rather then performance parts because I don't want to make the car harsher or noisier. I've put quite a lot of effort into loudspeaker upgrade and bought an original full set of Porsche speakers then stripped them out and replaced all the drivers so that I could get a completely stealth update (no wiring or mounting mods) and also retain the original units for subsequent reinstatement. A lot of people decry the need for music in the 993, but in my opinion, it's no more interesting to be sat on a damp motorway in traffic for an hour in my 993 than it is in any other car, so I'll have a decent stereo to while such times away thank you !
My non-standard mods (done and planned):
1. (done) Replace headlights and all exterior bulbs with Bergville HID and LED kits
2. (done) Replace internal bulbs with Bergville LED kits (except the Dash lights - I like the retro orange glow!)
3. (done) Fit motor-sound airbox (original option, cheap from Porsche dealer and nice subtle, non-boomy noise enhancer)
4. (done) Replace headunit with a period Becker Cascade unit which incorporates full bluetooth streaming, hands free phone integration, retro satnav and a hidden USB charging point
5. (done) Stealth upgrade on speakers to fit JBL, Kicker and Audisson units into a replacement set of Porsche housings, using VW connectors to be able to connect up units without any wiring or mounting mods to the car.
6. (done) Replaced four spoke steering wheel with a 3 spoke leather unit from the boxster of the same period (midnight blue to match interior) - very slightly smaller and very slightly closer to the driver (both of which are good things imho)
7. (done) Fitted the strengthening/straightening bar to the raising spoiler unit to correct warp (porsche repair part) - not strictly a mod, but a nice improvement of a fault many will have. Check your closed spoiler and see if it sits proud of the bodywork line at the top - once you see it, you won't be able to leave it [
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8. (planned) replace shockers with Koni FSD units (seem a good fast road compromise and the Monroes are silly money and outdated tech)
9. (planned) remap from Wayne - mine has the "poor fuel option" from the factory so I can justify removal of this to myself !
Other than these, I've concentrated on progressing through replacements and refurbishments using all original parts - it's truly amazing what refreshing components such as engine mounts and other worn components do for the dynamics of these cars.
Andrew