I am looking for modification available with Mace for my VS Ecotec. All I have at the moment is a 2.5 lukey exhaust with no rear muffler and pod filter also would you know if these reduce power?

A pod filter exposed to the engine bay (unshielded/boxed) will end up reducing power compared with the factory setup. More importantly though, if you’re running a MAF to Pod adapter and haven’t located your temp sensor properly then then computer won’t be able to accurately measure air flow or air temp which is bad