CAMARO6 - View Single Post

oldman · 04-15-2020, 03:48 PM

at low engine speeds say 1200 RPM in higher gears, the car can't be driven and sounds terrible. Don't remove your primary cats unless you do something (maybe Bolra 60608) and keep the stock factory suitcase. I have an M6 SS, I've heard the same complaint many times for Zl1 (auto or manual). So it ain't a sound issue, it is a run like crap and sound issue. There seems to be NO issues other than been heck of loud if one uses any or no muffler, this is with the factory suitcase.

Look GM must know there is an issue hence the auto with active AFM, uses valves to close down the exhaust and create some backpressure in the exhaust. This happens only at very low throttle settings and RPM.

04-15-2020, 03:48 PM	#27
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,332	at low engine speeds say 1200 RPM in higher gears, the car can't be driven and sounds terrible. Don't remove your primary cats unless you do something (maybe Bolra 60608) and keep the stock factory suitcase. I have an M6 SS, I've heard the same complaint many times for Zl1 (auto or manual). So it ain't a sound issue, it is a run like crap and sound issue. There seems to be NO issues other than been heck of loud if one uses any or no muffler, this is with the factory suitcase. Look GM must know there is an issue hence the auto with active AFM, uses valves to close down the exhaust and create some backpressure in the exhaust. This happens only at very low throttle settings and RPM. __________________ 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.