I have a 2005 G35 Coupe 6MT and I just found out that I have a bad cat. I've been wanting to purchase at cat back exhaust system for the longest time now, but now I see I'm going to have to replace the cat as well. That being said I'm going to just go with replacing both Cats as well as getting a cat back exhaust like i wanted to do instead of paying the ridiculous amount of money to replace 1 OEM cat. I'm not to familiar with this subject and have been doing so much research on the forums and still seem to be a little lost with what I need to do. Do I need to buy HFCs and then a cat back exhaust system? If that's what needs to be done what are some of my options for the best deep sound not being very raspy. I was looking at Fast intentions HFC would it be best to the get the matching FI cat back or can you mix brands when doing that. I'm not really worried about performance gains bc I know 10-15HP gain im not going to really feel anyways. Also what is the HKS Hi-PowerFull Exhaust? Would I need to buy that plus the additional Cats? Any info would be greatly appreciated.

 

Yes, you will need to buy the replacement for the cats (HFC, test pipe, or whichever you decide to go with) and the cat-back exhaust system separately.

And yes, you can mix and match since both components are made to replace the factory components.

 

Hello
Matching is not required. You can go with the Berk HFC which are much better in many cases and pair it with the HKS HI Power, or the Motordyne TDX-2 or the Ark Grip Etc etc.

Would you like some pricing on those setups?

 

Right on que to help. They need to give you a raise!

 

Thank you feel free to tell that to my boss