KL-DE Exhaust Back Pressure
I'm really wanting a straight pipe exhaust for my car. I've searched around for a definitive answer to what size pipe I should use, some have said 3", some said 2.5", and so on.
I apologize if this is in the wrong section, but what sized piping should I use? I really don't want to buy everything and make it to find that there's too little back pressure and it affects power severely. I don't mind a little power drop, so long as it doesn't damage anything in the engine or has a big power drop.
The engine is a KL-DE.