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ZL1GEEK · 02-21-2020, 03:46 PM

I have a 2018 ZL1 with the 6 speed manual, I'm reading that on the manual cars there is no AFM ( active fuel management ) system. However, even after the NPP exhaust fuse pulled at idle the damn car still gets quite. I know with the AFM there are another set of exhaust butterfly valves right after the back axle. They are there to provide back pressure when the AFM goes into 4 cylinder mode correct? So if the manual cars don't have AFM why does my damn car go quite at idle?
I want that obnoxious sound it gives at start-up to stay there.
So if the valves are in fact there and are in use, is there a trick to get those to stay open ( no tune )?
Thanks

02-21-2020, 03:46 PM	#1
ZL1GEEK Drives: 2018 ZL1 Hyperblue M6, 99 Camaro SS Join Date: Jun 2018 Location: Virginia Posts: 36	AFM on the M6 ZL1 I have a 2018 ZL1 with the 6 speed manual, I'm reading that on the manual cars there is no AFM ( active fuel management ) system. However, even after the NPP exhaust fuse pulled at idle the damn car still gets quite. I know with the AFM there are another set of exhaust butterfly valves right after the back axle. They are there to provide back pressure when the AFM goes into 4 cylinder mode correct? So if the manual cars don't have AFM why does my damn car go quite at idle? I want that obnoxious sound it gives at start-up to stay there. So if the valves are in fact there and are in use, is there a trick to get those to stay open ( no tune )? Thanks __________________ 2018 ZL1 M6 Hyper Blue, 2013 ZL1 SOLD, 1999 SS Comp cam, Few bolt on's.