Exhaust Bullet Style Catalytic Converters

[stykthyn]

When I bought the car it came with a mac offroad H pipe and all the smog equipment removed. Fast forward and I'm tired of smelling like fumes when I get out of the car. Would newer style cats that dont need air piped through them work to filter the HC's out? My wrangler doesnt have an air pipe and its cat is just fine. What gives?

 

[FoxMustangLvr]

I don't see why it wouldn't work. The exhaust shop I just went to last week was telling me about some good quality after market high flow cat's I could install on my car without the need of my air pump/thermactor system. It was nearly $250 per cat installed into my existing o/r h-pipe. I might do it down the road if I can't get my fumes under control but first I'm going to try running 87 octane instead of 93. I've read a lot about how advancing the timing on a stock engine and running 93 does nothing but make your car stink real bad from unburnt fuel. Best bet is to bump timing the most you can while keeping 87. Lesson learned for me.

 

[stykthyn]

I've done that already. It's more bearable but still noticeably strong. I need to replace my mid pipe or at least have the crossover tube replaced. Want to weld in two cats while I'm at it.

 

[MFE92]

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

 

[stykthyn]

That is exactly what I was looking for. Thanks!

 

[stykthyn]

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.

 

[84Ttop]

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

This is great info, Thanks for sharing!

 

[MFE92]

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.

Hardly at all, if at all.

 

[FoxMustangLvr]

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.

Thanks @MFE92

 

[stykthyn]

http://www.summitracing.com/parts/mpe-53956?seid=srese1&gclid=CLzh9IDlsMgCFVaRHwodtSoKYg

 

[FoxMustangLvr]

http://www.summitracing.com/parts/mpe-53956?seid=srese1&gclid=CLzh9IDlsMgCFVaRHwodtSoKYg

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.

TWO-WAY CATALYTIC CONVERTERS

• Allows oxidation of CO (Carbon Monoxide) to less-harmful CO2 (Carbon Dioxide)
• Allows oxidation of HC (Unburned Hydrocarbons) to CO2 (Carbon Dioxide) and H2O (Water)

THREE-WAY CATALYTIC CONVERTERS

• Allows reduction of NOx (Nitrogen Oxides) to N2 (Nitrogen) and O2 (Oxygen)
• Allows oxidation of CO (Carbon Monoxide) to less-harmful CO2 (Carbon Dioxide)
• Allows oxidation of HC (Unburned Hydrocarbons) to CO2 (Carbon Dioxide) and H2O (Water)

 

[stykthyn]

Ah, didn't notice the change in part#.

 

[FoxMustangLvr]

I'm learning as I go so I thought I'd share more about it, here you go and I hope this helps.

59596 has a metallic core
53596 has a ceramic core

Also this from a website I just looked at...........

I contacted our representative at MagnaFlow about the differences in the metallic and ceramic catalytic converters.

The representative informed me that the metallic catalytic converters, like part # MF59956 are a bit stronger and would be good for applications where the catalytic converter is close to the header as they can handle more heat. The metallic ones are usually used on OBD1 applications.

The ceramic catalytic converters are not as strong and usually do not last as long as metallic substrate converters. Typically the ceramic converters are used on OBDII vehicles.

 

[FoxMustangLvr]

Ah, didn't notice the change in part#.

Oh, well I'm glad you caught that before it was too late.

 

[MFE92]

You're going to be using two of them, so the engine capacity thing is pretty irrelevant. If you're looking for straight-in, straight-out 2.5-inch converter, 59956 is the one you want. Unfortunately Magnaflow's new website blows goats and you can't seem to search the catalog unless you put a vehicle in it, and that will never turn up the spun metallics. You can search by part number and find it, but you can't find the rest of the family, because they have a lot of different sizes and inlet/outlet configurations. Total waste of ing time.

 

[MFE92]

Another testament to the Magnaflow spun metallics. I still had the old failed ones on the car, but I was tired of the stink, and I came due for another test. Now I have a new engine with an E303 cam that had me a little worried. I slapped in a new set of Magnaflow 59926's, dialed the timing back to 8 degrees, and PASS for another two years

Those numbers are actually better than a stock cat pipe on my old engine.

Gas.....Allowed....Test
HC.......1.00........0.44
CO.....12.00........3.85
NOx.....2.50........0.67

 

[7991LXnSHO]

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.

 

[stykthyn]

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.

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?

 

[Noobz347]

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).

 

[Noobz347]

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).

Whooooooooooops. I may have been wrong. I think Bassani still makes all of Anderson FMS exhaust pieces:

http://www.andersonfordmotorsport.c...verter-stainless-fits-86-93-mustang-5-0-5-8l/

If that is still the case, then I'd bet that those are probably the best you can find for a Fox without having them custom made.