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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 04-07-2015, 01:17 PM   #1
jimmer1290
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exhaust and headers....tunings required? PLEASE HELP

Hey so I have a 2013 fr-s manual. I am looking at installing borla equal length headers, a greddy evo cat back exhaust system and a greddy cold air intake.

Two questions:
This is my first mechanical project on the cat anyone do this set up or gave tips?
Secondly, will my car require tuning after these changes are made, I use the car about 3 times a week so decent daily driver and I am unsure if the mods will make it unstable.
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Old 04-07-2015, 01:40 PM   #2
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Advice: Check out the DIY section of the forum. All of the mods you are thinking of have examples there.

Tuning: The only mod that would really require a tune is the header change. I'm assuming you are going catless. The CAI might need the MAF scaled, but depending on where you get your tune done it might be included as part of that. Cat back does not benefit from tuning.
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Old 04-07-2015, 01:43 PM   #3
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Well for now I'm just doing the headers and leaving the oem cat alone, ill deal with that later if I chose to. For now just the headers and the cat back everything in between is stock
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Old 04-07-2015, 01:47 PM   #4
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The stock header has a cat in it.

After a while 50+ miles you'll probably get a check engine light if you don't get a tune. Not to mention you'll run leaner than you probably should. Your car won't immediately explode or anything, but it will run better and safer with a tune.
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Old 04-07-2015, 01:49 PM   #5
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Oh wow I did not realize the cat was directly in the headers I thought it was later on in the line.
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Old 04-07-2015, 01:53 PM   #6
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We have a two cat system. There is a cat in the header and a second one downstream in the mid-pipe IIRC.
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Old 04-07-2015, 01:59 PM   #7
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Wow ok might be better for me to just scrap the headers for now unless I find one with cat and just do the exhaust until I'm ready to get it tuned etc.
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Old 04-07-2015, 02:24 PM   #8
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if you aren't ready to get a tune with the header you'll be far better off replacing the catback and front pipe (which houses the second cat) and leaving the rest stock. no CEL and no tune needed.
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Old 04-07-2015, 02:47 PM   #9
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if I replace the front pipe, can I get one without the second cat and not need tuning, or can you get an aftermarket one with cat system
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Old 04-07-2015, 03:04 PM   #10
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Quote:
Originally Posted by jimmer1290 View Post
if I replace the front pipe, can I get one without the second cat and not need tuning, or can you get an aftermarket one with cat system
Correct. If you buy a catless front pipe, a tune will not be needed. You can also buy one with a cat.
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Old 04-07-2015, 03:17 PM   #11
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Not sure what your goals with the mods to the exhaust are, but note that almost all of the power comes from removing the cat in the header and getting it tuned. You will change the sound by replacing the rest of the exhaust but the power gains will be marginal.
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Old 04-07-2015, 04:44 PM   #12
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Old 04-07-2015, 05:59 PM   #13
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Quote:
Originally Posted by jimmer1290 View Post
Hey so I have a 2013 fr-s manual. I am looking at installing borla equal length headers, a greddy evo cat back exhaust system and a greddy cold air intake.

Two questions:
This is my first mechanical project on the cat anyone do this set up or gave tips?
Secondly, will my car require tuning after these changes are made, I use the car about 3 times a week so decent daily driver and I am unsure if the mods will make it unstable.
Read the Basic Bolt on Mods and Tuning link below
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Old 04-07-2015, 09:09 PM   #14
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Originally Posted by Jonsey View Post
Not sure what your goals with the mods to the exhaust are, but note that almost all of the power comes from removing the cat in the header and getting it tuned. You will change the sound by replacing the rest of the exhaust but the power gains will be marginal.
+1 to this

If you don't care about performance and just sounding fast/nice, get an aftermarket Catback etc.
If you are interested in performance, look into getting a header/tune: such as the Open flash tablet // Open Flash Header combo. http://www.openflashtablet.com/Autom...OFH/index.html
One of the best upgrades you can do to this car for $1K, that alone will nearly remove the torque dip and you can further remove the dip by switching to E85 fuel.

Refer to Steve's many many helpful threads that he has in his signature
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