Hi everyone
I have a 2013 ZL1 with auto transmission. I love the sound it makes on decelerating or downshifting. The "brabbels" and sometimes there are also some pops. However I have an issue if I rev it when the car is stationary. If I rev it above 3000rpm and let of the gas, it makes quite a loud bang. It really sounds loud and I am concerned about my cats.
Or is this normal for the ZL1/LSA? The other concern are the cops. In Switzerland we have very strict rules and fines are astronomical for "too loud" exhausts. My car is allowed to have 96db on stationary sound test revving to 3750rpm and letting of the gas. Now with that single loud bang I reach 115db and this would screw me if I ever have the cops checking my car.
Anything I could do to reduce this "bang" when stationary or is this just how that car/engine behaves and not much I could to to program that out?
What I can say is that this bang just happens if the engine is hot. It also happens if I turn it off when hot and start it again - it starts and there is this single loud bang.
Car is bone stock but the previous owner had it tuned because of 200cpi cats and CAI. According him everything (incl software) was put back to stock but maybe it is not. I am currently waiting for my mpvi2 to compare my software to a stock ZL1 and see if there are still some differences.
Sorry for language - I am from Switzerland.
Br
Zeee