I read that when I add an upgraded exhaust and downpipe to my 87 turboII the 6 port actuaters will be inconsistent due to an improper o2 readout.Is this true and if so would it be beneficial to add a wideband controller to my car?how does this work?RX7.com also explains this problem in their exhaust section of products but does not say whether or not their bonez products compensate for this.

 

There is no 5/6th ports on a TII.

 

Cool, so i can go ahead and add the downpipe and cat back no worries.Thanks for the help.