Ok i put a zzp catless dp on my car and now when i NLS it makes a weird i guess popping noise when i do it. And sometimes when i nls at high boost it will make the popping noise and continue until i usually let off the gas for a little then get back on

 

if its making more than one "popping noise" (its a normal noise during NLS), you're hitting the rev limiter because you aren't shifting soon enough.

 

im shifting at 6k or a little over never hit 7

 

mine does it all the time even if i dont NLS...mine goes nuts when i give it and granny shift it and makes like 4 pops lol

 

one pop is normal, bunch of them is missfire, check to see if u have a flashing cell when that happens.

 

i just bought some ngk colder plugs so well see if it fixes it

 

Remember, the Tach in these cars is slow...

 

u kidding me, theres nothing "slow" about a super sport cobalt!