First Trust NASDAQ Global Auto Index (CARZ) raced ahead 22% the past three months, leaving the SPDR S&P 500 ETF (SPY) in the dust with 6% gain. On a one-year basis, CARZ gained 18%, not much faster than 16% for SPY. The ETF holds 35 stocks of auto makers from 10 countries valued between $500 million and $161 billion. Here's an overview of five catalysts driving this ahead of the pack. 1. Consumers are buying cars at a healthy clip although they're