This is great info, Thanks for sharing!I installed some Magnaflow 59956 Spun Metallics a few years ago for exactly this reason. At the time, I didn't have to undergo emissions testing, I was just tired of the stink. They're so tiny it's hard to believe they do anything at all, but they worked like a charm, and withstood the abuse of road course hammering for several years too. When I moved to an emissions-testing county, where pre-OBD-II cars get a dyno sniff test, they passed pretty well. A few years more abuse, and they failed, but I'm going to replace them with identical units when the time comes for the next test.
Three years into them, I got these results:
test...allowed...result
HC......1.00......0.63
CO....12.00......4.16
NOx....2.50......0.82
At 4.5 years/33000 miles on them, I got these results:
Test...allowed....grams/mile
HC.......1.00........0.64
CO.....12.00........7.77
NOx.....2.50........0.38
With with 6.5 years and 40,000 miles on them (probably 10% of those on road courses), I got these results, and failed, even with new plugs/cap/rotor
HC.......1.00........1.35
CO.....12.00........26.92
NOx.....2.50........1.63
I put a stock H-pipe back on it, still no air pump attached, and got this. Notice how similar the stock H-pipe is to the original readings I got at the 3-year mark with the Magnaflows:
Gas.....Allowed....Test
HC.......1.00........0.63
CO.....12.00........3.86
NOx.....2.50........1.27
I see summit stocks them for around 80 shipped. That's not bad. Did they quiet the exhaust at all? Not that it's a concern, just curious.
For the 59956 model it's $97 but that's if you have a 2.5" exhaust. Either way it's a fair deal and for each Cat you purchase you get $25 in Summit bucks, woohoo! I think I might do this for my car if switching to 87 doesn't clean up my exhaust smell enough.I see summit stocks them for around 80 shipped. That's not bad. Did they quiet the exhaust at all? Not that it's a concern, just curious.
The 53596 says it's only good for vehicles with engines up to 4.2L. The 59596 is good for vehicles up to 6.2L. Also the 59596 says it's a 3 way converter, this is very important! 53596 says nothing about this.
Oh, well I'm glad you caught that before it was too late.Ah, didn't notice the change in part#.
Why add it back if mfe has provided concrete evidence that the spun metallics work better than the stock units and all of its accompanying hardware?I dislike the smell, even after the other codes and computer issue are as fixed as I can get them.
The air pump, head crossover pipe, and valve stuff missing from my car only weighed only 8 lbs. So I am putting it on with the right cats in a new high flow X pipe.
If 8 pounds slows it down, the driver of my car can loose the weight instead.
3-way converters don't need air pumps. Most after-market converters are 3-way.
The setup I have are these same after-market converters in an X-pipe (that I don't think Bassani makes anymore).
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