The computers DO worry me in terms of maintenance, as they also are designed to "protect the car," as car computers do. So if the computers sense something wrong, they'll either stop the car or put it into the "limp mode," ie only allowing 2nd gear and reverse. It's not like you can "limp" it into PepBoys for a quick fix. A total of 194 of these were made, with the total motor/engine management in ANY Mercedes maybe totally just over 1000 for ALL of the 3 years. In addition, this one's primary engine management is after-market, making it even rarer. I replaced 3 of the window rubber moldings. They had to be tracked down and cost right at $1000. I know the engine management computer is nearly $5K from the aftermarket company.
So I don't worry of it in terms of performance as I'll never push it that hard anyway - because I'm afraid of it overall. The cost and reliability factor does concern me - quite a bit actually. Even in mass produced cars, a non-warranty repair bill for replacing the engine management computer typically is over $2000, and over $3K for new cars.
When a tow truck driver tried to jump my wife's R350 with a dead battery (not know what he was doing) he fried the main engine computer. Over $3K to fix, and over a week waiting for it to be shipped from Germany.
The "old cars" are VERY simplistic and cheap to fix. If from the 60s/early 70s, you can buy a whole long block for around $1000 (rebuilt or salvage) and trannies are generally under $500. You can bolt on an out-of-the-box carb for under $500. Do it yourself. Price out a redo on a computer run fuel injection system. Like I've said, the old classics are absolutely cheaper to maintain, to modify and can be more fun to drive, but they aren't as safe, get far worse fuel economy, and do not perform as well.
Race-track cars are an entirely different set of questions and issues. I'm posting about street legal and comfortable cars. If you want to go really, really, really fast, buy a vintage F1 or drag race car (they're cheap used) and make it street legal. You give up EVERYTHING else, but it will be F A S T.
"Half full or half empty doesn't matter. What matters is, you've only got half a glass...so what are you going to do about it?" - Me