Intake and exhaust mpg?

[Sandmanpimp]

Ok so I'm sure people have talked about this but I'm trying to find out about my specific situation. I have a 1991 240sx completely stock and was wondering if adding a cat back exhaust and cold air intake will actually raise my mpg, and if so what can I realisticly expect? Is it even worth it? Also not that it's my main concern but will I notice a power difference at all? Thank you guys for your input...

[Gabe.S]

You will gain some mpgs depending on the condition of your motor auto/manual but not enough to make a diff. You wont notice the hp difference unless you boost it or do something significant like boost or cams.

[ohreally21]

Watch out what air filter you put on there. Some air filters are known to actually hurt MPG's. Check around and see who has what.