If you're refering to the carberated CRX in ITC, there has been no change in minimum weight. The only failure I've had of any front end parts came this year with a torn boot that caused the grease to go away and ruin the CV joint. That was a result of my overlooking a loose suspension piece, not a weight issue or a poor maintenance problem...just stupidity. The only suspension part I've ever had to replace due to wear was rear hub bearings.
My understanding about weight additions is the reason for the SIR on the BMW's in ITS. An increase in weight would create reliability problem in suspension parts, etc. At least that's what I got from screaming BMW owners.
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Actually I was talking about the 88-91 standard CRX which came with a 1.5L fuel injected engine and rear drums as opposed to the CRX Si with its 1.6L engine and rear discs.