Are you sure you are untightening the right bolts? The end that is facing the front are welded in place. The nut which is facing the back end is what you want to loosen. You will love the sound. 2 washers is what the Nismo should have sounded like from the factory. Still quiet on the inside for the highway till you get on it and nice throaty sound comes at ya. 3 washers and it gets louder and deeper and you won't hear the engine noises anymore, just exhaust. For long highway rides you're gonna hear constant exhaust note. 4 washers and it gets loud, you'll start to feel vibrations in the steering wheel and some things shaking a little bit but it sounds mean.... I did all this and thinking back now I should have kept it that way just for the adjustability. But I did a muffler delete and pretty happy with it, took a min to adjust with baffles and all but the washer mod on this car sounds pretty good. I've heard it on other cars and it just sounds like crap. Have fun.
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