I've decided to get a better exaust for my Z, I know I'm going to get the HMF competition series, can I pair that with a Fmf powerbomb header? I'm looking for maximum power and noise isn't a big issue

I have a 07 Suzuki ltz 400 that makes the common clicking noise when I try to start it I Replaced the battery first and it didn’t fix the clicking noise. I then replaced the starter solenoid which also didn’t fix the problem I then got it to start turning over by tapping on the starter so I...