I've got the MPE and felt just like you... it was great but I wanted some more deepness, because it sounded like it was still restricted... So I remembered that the old n55 MPE (for 135's) deleted the resonator so I figured why not, let me delete mine.
Made a WORLD of difference.. now it's perfect. There's no drone with the windows up and it sounds amazing when I step on it. With the windows down forget about it. Best $100 In total it was $835 to get the MPE and my resonator deleted. Worth every cent.
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