cutout for borla
#3
Where are you mounting it? If it's going somewhere on the I-pipe (under rear passenger seat) than it'll be 3". I have a Borla cat-back and put a 3" QTP E-cut out on the I-pipe underneath RR seat.
#4
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Guessing you mean where the adjuster plates go, right? As far as I know anything will work. I have the normal QTP on mine and it fit just fine. I love that I can have that straight piped sound out the back with the major drone inside.