I have been combing the boards and asking around to see which aftermarket converter yeilds the highest flow rate while still retaining a legal emissions rating. I was pretty leary at first to even change it, seeming as how i barely passed emissions last year. But, to our suprise, when we cut the stock converter out, it was 100% hollow. Bone, bare-ass hollow. Yes thats right, i passed emissions with a bad O2 sensor, which was throwing a check engine code on the dyno, and a hollow cat. Amazing!
SO anyway here are the stats from this year vs last year. (Std: standard value set by the state, 2004: hollow cat, 2005: dynomax superconverter)
High speed (25 mph)
…Std…2004…2005
HC…136…103…8
CO (%)…0.76…0.51…0.02
CO2 (%)…14.3…15.2
O2 (%)…0.8…0.1
NOx…984…148…139
Dillution…>6…14.8…15.2
Low speed test (15 mph)
…Std…2004…2005
HC…141…134…14
CO (%)…0.79…0.14…0.03
CO2 (%)…14.4…15.2
O2 (%)…1.0…0.1
NOx…1088…166…215
Dillution…>6…14.5…15.2
Its an amazing difference, dont you agree?
An odd thing i noticed was in the NOx reading, it was actually higher than before. The only reason I would see this happening is because I had the cat welded on the day before the test, and I only put like 100 miles or so on it.
The cat i used was a 3-way 2" in/out Dynomax Superconverter. Ordered from Orilie’s, the total came to 65 bucks. The install was only 10 bucks at my friendly neighborhood Muffler shop. (Thanks J!)
As far as a performance aspect is concerned, no dyno yet. It feels a bit more beefy off the line and down low in the RPM’s, but not so strong up top. If you can get it installed for under 80 bucks like I did, and you are in dire need of a catalytic converter I would reccomend it. But honestly, I felt more of a difference in power when I re-installed my custom 3" CAI…
just my .02 for G2IC, LONG LIVE THE DA!!!
Key for chart:
HC: Hydrocarbon
CO: Carbon Monoxide
CO2: Carbon Dioxide
O2: lol, duuhhhhh
NOx: I believe its any form of Nitrous Oxide?
