I personally dont care if you check it or not. I was just letting you know that now would be the time to do such a thing. If you dont your an idiot. Think of it this way. Your already spending a good amount of money on this set up with one thing in mind. “Going Faster” By skipping this simple quick step not only will you loose power from loosing compression but you will be spending more money to fix it later. If you dont have the money to do it correctly now what makes you think you will have the money to fix it later.
are you looking for more top end power or more streetability? 4" DP’s only show improvements in higher boost levels