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60608 borla twin resonator mid-pipes are only for slight sound attenuation (works well for de-cat). Since the factory header is like 2.1 ID and driver's side cat is like 2.05 IDS neck down to 1.85 ID at the o2, I can't see how anything inback of that would help much for HP. The factory system is 2and 3/4 OD. Borla piece wise parts are 2 and 3/4, only their complete stuff is 3".... You really have to be making big HP to even worry about anything cat back and even then it ain't all that much. I'd be surprised at 6 HP cat back on a 3/4 build NA setup, that is 1% almost within measuring error.
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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