Hello all, I just have a few questions that you might find stupid

I recently bought a 93 del sol with the d16z6 on it with the intent to install the Greddy td04h-15g bolt on turbo kit. When I bought the car it had dual exhaust (Why? I dunno). My first question is since I'm not really going ***** out just want a little more power is it worth the money to switch it back to a full 3" system and what would be the benefits? Also, With this being my first install, where would be the best place to tap into on this motor for my oil pressure and for my Air/Fuel (Or is there a bung already there with the kit for it)?

Thanks in advance!

 

anyone?