So just so I understand, the SuperCircuit Headers replace Cat #1 and bolt up to the existing OEM exhaust leaving Cat #2 with no modifications?
So just so I understand, the SuperCircuit Headers replace Cat #1 and bolt up to the existing OEM exhaust leaving Cat #2 with no modifications?
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View my fuel log 2015 Mirage ES 1.2 automatic: 40.5 mpg (US) ... 17.2 km/L ... 5.8 L/100 km ... 48.6 mpg (Imp)
On the Mirage HB your statement is true.
On the mirage g4/ Attrage this statement is not true. You have to shorten the oem exhaust but you can still keep cat #2.
This is what i am trying to inform others.. that the aftermarket headers will not bolt up to the oem exhaust without modifications for mirage g4/ Attrage 2016. Not sure about older ones though.
Daox (06-12-2017)
Agreed. I experimented running with both cats hollowed out and it was not pleasant. Hollowing just the second cat gave it just a touch more gutteral sound but still quiet and no drone at all at any rpm or engine load.
inuvik (06-12-2017)
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
Pryme (06-12-2017)
You will get a check engine light because the ECU will think the primary Cat has gone bad. I think the air fuel ratio is reported to the ecu by the primary O2 sensor only.
The headers don't seem to have a bung for the second O2 sensor, so I wonder if some countries only came with one sensor?
gone.a (06-12-2017)
Has anyone tried removing the muffler and resonator and running a straight pipe? I wonder how that would affect performance.
A friend of mine did this years ago with his Dodge pickup truck with a 318 V8 engine. He kept the catalytic converters, which seemed to do enough to smooth out the exhaust but still gave the rumble that so many find appealing.
Last edited by Eggman; 06-12-2017 at 12:42 PM.
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
I just realized there are atleast 3 different manifold front cat's for these cars. 15's have the front 02 sensor on the top of the manifold pointing straight down with a separate front cat, the 17's have the front 02 sensor on the rh side of the cat and the manifold doesn't unbolt from the cat. The pics that Fit posted are different all together and are kind of a hybrid of the 15' and 17'. Looks like the 02 sensor location of a 15' with the non-removable cat of the 17's.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)
Daox (06-14-2017)