Just what the title says. I had mine on for a year. Its a POS. I was running a little rich, but not too bad and I look back through my logs and after just a few short months of using it it was nothing but an exhaust restriction. After about 6 months I started getting exhaust leaks elsewhere due to the backpressure. It made the car run sub par and I thank Mellon for helping me find the problem.

I took it off last night and youc an't even see any light through the honeycome and the honey come has come loose and is laying almost sideways creating a great restriction. Its started falling apart and this is only after a year, I imagine its been like this for 6 months. If your really really set on a HF Cat spend the money and get a good one and pull a log every month or so and see if your airflow is dropping off.

Thats just my P.S.A. for today. I had good reason to run it last year but I am beyond that now and I won't ever make that mistake again.

 

Test Pipe


FTW.

 

^^^^^^^ True why bother with a high flow cat? If your gonna mess with it might as well put in the test pipe man.

 

I think that people get high flow cat because of not throwing on their CEL.
Correct me if I'm wrong.

 

I use an HFC for not having a guilty conscience because I'm spewing crap out my tail pipe all day long ... but I do switch it to a test pipe for race days at the track

 

There are easier ways to keep from setting a DTC and turning on the MIL.

That was part of mine, and the infant in the back seat with the windows cracked I hated getting that smell and those fumes in the cabin when she was in there. However after a while the backpressure made it leak other places so you could get it in the cabin with the windows closed and fan on

My only point is, if you need/want an HFC for whatever reason stay away from this one or keep an eye on it cause it won't last period. Its a whole lot of money for an exhaust restriction thats gonna stop working in 6 months.

 

Test pipe= easy extra 10hp

 

just punch it out with a stick and turn it into a test pipe.

 

It is true about your car throwing a cell. What a lot of people do is put on a spark plug fowler on the O2 sensor and reset the ecu. Works like a charm.

 

Yes but eventually it will come back on, it took my car about 25,000 miles to do it, but it will come back.


Some times for the extra power you need to put up wit the SES light.

Im sure more than half the modified evo's on here are running with a SES light, all you do is check the code, make sure its the o2 sensor and live with it.

 

Wow! So it took 25,000 miles for the light to come back on? Well what I did was double up on the fowlers....took a little drilling but I haven't had trouble since. Ill make sure to look out for that code to come back on then.

 

You're welcome Dave, the car is definitely flowing better now...you might as well of had a potato shoved in the tail pipe before

 

Just turn the cell off in the ROM. But O2 foulers and extended bungs def work 100k no P0420

 

fixed...

 

off topic, but dont use a megan up-pipe on a WRX either. the flex section comes apart inside, and blocks the whole thing off to about an inch diameter.