id just do longtubes and be done with 
im running the mrt2, obx lt, no res and i can attest to there being no drone and the rasp honestly goes away after about 200 miles of driving. my 0-2000 rpm sounds exactly the same but deeper as with just mrt2. but after 3500k its amazing!!! and power is there. i will be uploading better ones now since i have broken them in. LT and never look back. v6 or v8
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Performance Mods: Vararam Intake, MRTv2.0 exhaust, Elite Engineering CC, Vmax Black Iceolator, Vmax Ported TB, OBX LT Headers w/ no CATS, LMR Tune
Visual mods: Eagle Eyes w/5k hids, Custom Hood Spears, Heritage Grille, Stage 2 LED Dome lights,Transformer Emblems, PD Bezels, 19in Chevy rims with pirellis, Blue painted calipers, GM GFX Front Splitter, 35/20 % Tint, TailLight Tint(charcoal)
1/4 Mile: 13.65 sec @ 102.53 mph R.I.P.
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