I was wondering if anyone has installed a HFC and tuned? Is the stock exhaust that restrictive where I would NEED a CBE?

I've read where you can change the CBE and not require tune. So I was thinking if I got a tune and get a HFC now, I wouldn't have to get another tune when installing a CBE.

Will this setup be beneficial?

My EVO is starting to feel a tad bit slow, and I was thinking about getting a tune. But, I figured what the hell, might as well install a HFC. I would do both a HFC and CBE, but I didn't want to shell out that kinda money right now (just got done replacing my rotors, brakes, fluid changes, and installing minor mods).

 

no need for a tune on a catback exhaust since the stock cat will still be restrictive. a test pipe or hfc however will require a tune but it would be a waste of money to install one and get a tune when you can save up for other parts and get a tune with all the parts. i suggest investing on a bigger intercooler first since the lag caused by the pipes expanding seems to be a bigger issue.

 

Just get both parts done at the same time. Problem solved...

 

This is my understanding as well:

- Cat is the biggest restrictions of the TBE
- HFC/TP requires a tune, CBE does not

Given the above there is still some conflicting data regarding installing a HFC/TP on an otherwise stock system. Some threads suggest that doing so would yield almost no HP gain and is a waste of time. This is somewhat contradictory to the two facts stated above. However, while the cat is the biggest restriction, it's not the only restriction.

- Would installing a HFC/TP on an otherwise stock system yield an increase in HP?

- How would this compare to a full TBE?

- Do you need a retune after adding a CBE to an already existing HFC/TP

Can someone knowledgeable comment on the above. I'm thinking of installing a HFC and keeping the stock muffler (noise).



Care to expand on this statement?

 

The cat is the most restrictive portion of the exhaust. It will be the single largest performance gain in the hands of a competent tuner (bolt-on wise).

 

From what I understand (after reading a few other threads), the catback gives little to no performance gains. As stated above, the catalytic converter is the most restrictive and would yield the most if replaced with a TP/HFC. I am going to get a HFC for my RA and an intake for the GST base map tune. Technically, this would be considered a TBE if you also got a DP. The muffler and midpipe don't do enough to make a difference.