Performance means a wide range around here. If your basic bolt on's and a little extra boost (350whp or below) level stock is the best bet. Don't go throwing money at gadgets until you have a "FULL" understanding of how the stock works stock.
Now if your cranking it up 28-30psi, huge turbo, fuel management, squeezing every once yeah a wideband setup is a good move.
Myself along with many others have been very fast with just the stock 02 doing its thing. 10.50's on unopened motor here.. my next step is building a 4.5 so yeah that will have a wideband :biggrin: