Would anyone know if FI HFC are good on an HKS Exhaust system to give that lower sound on idle also would make the exhaust quite louder that usual? let me know, thanks

 

I had this exact same setup and I loved it. When you stomp on the gas, it's most definitely louder than without the HFCs. Cruising and idle sound is about the same.

 

oh okay.... so do you know how much these FI HFC cats are and would the #'s for cells matter? easy or hard to install? thanks for your opinion

 

Cell # changes the ability to flow and ability to reduce emissions.

FI cats new are between $500-600 normally.

 

Watch out for drone! I don't have the HKS but as soon as I installed the Berk HFC's I had drone at 1600-2000 RPM's.

As far as install there are 3 studs on each header that 2/3 have to be removed and on the third stud just the nut comes off...I learned this one the hard way. You will need extensions as well as a universal .

 

so the higher the number is there going to better flow and reduce emmisions or is it that if its like lets say 300 cell, the flow is not as good and more emmision?
lmk thanks again

 

bump... need help on this ^^^

 

Actually its the other way around. The more cells the more items to restrict airflow.

Yes more cells help clean the air and help with emissions but they restrict airflow and that robs you of horsepower

Thats why most guys who go FI ditch cats all together and either run test pipes or straight pipes.

If you need HFCs, I'd grab 300 cell and call it a day. I've had 300 cell Berk HFCs for a year and passed emissions last summer with flying colors.

 

Ditto! Sadly

My drone area is at 18-2500 rpm! Never had a problem with drone until I added the Berk.

 

If you get the HFCs make sure you get the extra bungs installed. I'd get an extra bung installed on each one. This way you add an A/F in the future or use an extra port for tuning (external A/F)

Also make sure the bungs are installed on the topside of the HFCs - specifically request this. You don't want to have permanent O2 sensor installed at the bottomside where it can collect with condensation.