I got an 87 gxl NA...im getting a full exauhst put on (DP to replace the 2 precats in to the main cat, straight pipe going into a single muffler that will replace the ypipe, running straight pipes from the muffler back). Will I need to do any fuel mods (new injectors, plugs etc...)???

 

no. you might run an aftermarket chip to get a bit more HP.

Be sure it's rated for a rotary, NA 86-88, full exhaust & intake.