I am getting a Custom Cat-Back exhaust sytem and muffler installed tomorrow, I will be adding a y-pipe later on, how much should I excpect to gain from the Cat-Back system? Also how much is a new fuel filter for a 97 Maxima and how do I know if the one that I have is bad for sure? If I could get answers to both questions I would be very greatful. Thanks a lot

 

about 5 to 6 hp from the cat back. and a new fuel filter is said to be changed every 35k

 

Thanks, I appreciate it! Do you know how much the fuel filter is? Thanks

 

About $15.