Tata’s updated price list post the implementation of Goods and Service Tax (GST) shows that the Indian manufacturer does not offer the Quadrajet 90PS diesel option with the Zest anymore. If you recall, the Zest diesel was launched in two state of tunes - the base XE variant had fixed geometry turbocharged engine and produced 75PS of power while other variants, including the XM, XMA, XMS, XT and the XTA featured a variable geometry turbocharger and put out 90PS.