1. General Motors shows strong momentum with RSI at 77.9. 2. Goldman Sachs raised GM's price target from $81 to $93. 3. Carvana will join S&P 500 on Dec. 22, price target raised to $420. 4. Carvana's RSI is at 78.6, indicating overbought conditions. 5. Both stocks gained 1.9% recently, appealing to momentum traders.