got a Q

i got a 2002 gt all stock i really want to put a flowmaster system on the car now my Q is would it be better to keep the pipes 2.50in or put 3in pipes the only thing is that i am not going to replace the headers or h pipe for now? what do u guys think

2 1/2 max

Stock is 2.25", and I'd upgrade to 2.5".

3 would only be good for a turbo:D