Magnaflow Spun High Flow Cats

[EddieVE06]

Hi

I have seen these on ebay for a reasonable price. They are 200cpsi, metal cats. I understand most of the forum members prefer the 100cpsi cats but I'd prefer the 200cpsi cats. I just wanted to know whether anyone has used these cats or knows much about them or may have an opinion on Magnaflow cats. They don't have a heat shield but I assume they would still be ok to put on a VE Calais V8.

The description says

These MagnaFlow universal spun catalytic converters utilize the revolutionary new catalyst technology. Using new manufacturing technology, MagnaFlow fabricates each converter body from a single CNC-formed and laser-welded tubular section, which is then spun into a round converter body shape. The MagnaFlow universal spun catalytic converters are literally manufactured around the catalyst, which is securely tucked inside and necks down to thicker-gauge material at the inlet/oulet for maximum durability.

http://www.ebay.com.au/itm/MAGNAFLOW-2-5-INCH-200-CELL-CPSI-METAL-CAT-CONVERTER-/200636161945?pt=AU_Car_Parts_Accessories&hash=item2eb6d8df99

Thanks
Eddie

[whitels1ss]

They look pretty good mate.

[poolkeeper]

Yeah they look good, solid.
The seller is excellent too!

[duke5700]

Justin is a good guy to buy from and they will be the real deal.

[EddieVE06]

Does anyone know how long the VE Cat is. Spoke to Justin he has also mentioned the oval shape high flow cats which is 33 cm long. That looks way longer than a VE Cat

[SSVHM2.5]

What headers are you using?

[EddieVE06]

hsv headers and cats at the moment

[D_BLOCK]

If his product line is like his customer service, i would imagine them to be a top rate product.I've just ordered an under drive kit for the VE,and
opted to do it outside ebay (saved some coin also).Very quick to respond and even quicker to post it off and provide tracking info. Justins a true
professional.

[Thunder]

A spun cat is a thin, single skin tube that has been formed around the substrate.
What happens when a stainless tube heats up?

When the substrate is bonded to a tube, and a separate case wrapped around the outside to form a 2nd skin, this minimises expansion and heat transfer.
It costs more to manufacture this way, but the product is stronger and warranty problems are minimised or eliminated.
Stainless costs money, so even just the difference in raw material weight tells the story, but then add the labour, manufacturing costs and polishing and you can see why other brands maybe just a fraction dearer than these ones.

Think of how powerful your engine is.
The smaller the holes, the more pressure and force is exerted on the substrate, so the more important it is to be strong.

[EddieVE06]

Thanks for the info. If I understand correctly I should probably avoid this type of cat?

Sent from my GT-I9100T using Tapatalk 2

[whitels1ss]

Thanks for the info. If I understand correctly I should probably avoid this type of cat?


Buddy, Magnaflow are one of the biggest selling aftermarket cats (plus they mak plenty of OEM stuff) out there.
Their warranty and after sales service is first rate.
I am certain they would have properly tested these before they put them on the market.
I would be happy to buy any of their products, I reckon you would be perfectly safe with them.

[Thunder]

Magnaflow are a good brand, and they have lots of great products.
There are lots of brands that sell single skin cats - not just Magnaflow.
If you look at the picture, Magnaflow have added a groove at each end of the substrate to minimise movement.

All brands give a warranty, but they don't pay the Muffler Shop for their time, and the customer is inconvenienced.
Over the years we have had to replace many "well known" brands of aftermarket cats under warranty, and if this wasn't a problem, why would we bother to get our own made?

Multi National companies make millions of products each week.
If they can save 50 cents in material cost on each item, this is a massive boost to their profits.
Often large companies adopt an "acceptable % rate of warranty returns" philosophy.

How many cars have single skin spun cats as OEM equipment? None that I know of.

Have you ever had to get a repair done on your car under the manufacturers warranty?
If they made a car that nothing wore out for 15 years, then everyone would go broke including them, and the price of the car would be 10 times higher.
Lots of products now are designed to fail just after the warranty runs out, and this is how they keep prices down and stay in business.

I am just pointing out the difference between a single skin cat and a twin skin cat, why there maybe a small difference in price, and why one maybe stronger and last longer than the other. Let's face it, there are many brands of cats out there now. Some are not branded, some are poor quality, and some have very little precious metal coating on them. There are varying levels of quality, and varying levels of price.

[SSVHM2.5]

hsv headers and cats at the moment

Yeah that is what I am running. Are you intending in keeping the HSV headers and running different cats? I am interested to know which way you go as I am also interested in making this modification.

[EddieVE06]

Yeah that is what I am running. Are you intending in keeping the HSV headers and running different cats? I am interested to know which way you go as I am also interested in making this modification.

Yes just looking to do the cats,leave the hsv headers and the HM 2.5 inch catback. Not sure how the sound will change either don't want it to become stupid loud

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[EddieVE06]

Ok, I gave the magnaflow cats a miss. I purchased the Venom High Flow Cats over the weekend. 2.5 inch in/out 200 cpsi and had them installed today.

My current set up is HSV Headers, 200 cpsi HFC and a 2.5 inch HM Perry Exhaust and CAI. A couple of things I found after the install. The fitter said the sound will actually get deeper as it carbon's up so even happier about that. The noise at idle is only slightly louder, I was expecting it to be louder so pleased there also, the best part though is that the tone has changed, it has more burble when accelerating, you can hear the burble as the revs rise, it seems to have lowered the amount of boom I had between 1700-2000 rpm. It is definately louder when you plant the foot, has more of an angry note and throttle response has improved. I'm hoping that it will get a little deeper over time. From the inside the sound has gone up every so slightly on idle but louder when you accelerate, sounds nice and not very obtrusive.

One thing that has got me stumped is, NO CEL light has come on. The new cats are in the exact same position as the factory cats, obviously being smaller at 4 inch they seem to sit a little higher. Almost all threads and posts I have read mention that the CEL light will come on once you replace the cats but in my situation nothing has come on. Not sure of this is normal.

[SSVHM2.5]

Sounds great. Did you get the Venom cats from Ebay? Do you mind me asking who did the work as your results are exactly what I am after. Also has your car been tuned and do you feel it will require a re-tune to make most of the extra flow??

Cheers

[whitels1ss]

Ok, I gave the magnaflow cats a miss. I purchased the Venom High Flow Cats over the weekend. 2.5 inch in/out 200 cpsi and had them installed today.

My current set up is HSV Headers, 200 cpsi HFC and a 2.5 inch HM Perry Exhaust and CAI. A couple of things I found after the install. The fitter said the sound will actually get deeper as it carbon's up so even happier about that. The noise at idle is only slightly louder, I was expecting it to be louder so pleased there also, the best part though is that the tone has changed, it has more burble when accelerating, you can hear the burble as the revs rise, it seems to have lowered the amount of boom I had between 1700-2000 rpm. It is definately louder when you plant the foot, has more of an angry note and throttle response has improved. I'm hoping that it will get a little deeper over time. From the inside the sound has gone up every so slightly on idle but louder when you accelerate, sounds nice and not very obtrusive.

One thing that has got me stumped is, NO CEL light has come on. The new cats are in the exact same position as the factory cats, obviously being smaller at 4 inch they seem to sit a little higher. Almost all threads and posts I have read mention that the CEL light will come on once you replace the cats but in my situation nothing has come on. Not sure of this is normal.

Sounds like a good setup mate, enjoy:cheers:

[EddieVE06]

Sounds great. Did you get the Venom cats from Ebay? Do you mind me asking who did the work as your results are exactly what I am after. Also has your car been tuned and do you feel it will require a re-tune to make most of the extra flow??

Cheers

I had a look on ebay but I then emailed George from Venom directly and went direct through him. He gave me a good price and I picked them up so saved on delivery also.

In terms of the workshop I went to a place called Exhaust World in North Melbourne. Now I would generally get Chev to do it as he services my car anyway but he is a little far away from where i live and couldn't take the hours off to head down and then pick up later so I went local.

I found a number of exhaust places didn't want to do it or wanted to sell me their cats etc etc. One place said "its too hard to do but I have some HSV cats if you want them", he didn't seem to understand that I already had them on my car.

These guys in north melbourne had never done this on a VE. I gave them photos of the cats and pipe work that is on the forum and the internet, he looked at it and said, no problems we can do it. They probably charged me a little more as i am probably the guinea pig for them but they turned it around in about 1.5 hours which i thought was pretty good. They also used the flange from the HSV cat because the flanges on the HM system are slightly different ( I'm not sure on that).

The exhaust guy also said my CEL light would come on and he was a little stumped when it didn't.

[EddieVE06]

Also has your car been tuned and do you feel it will require a re-tune to make most of the extra flow??

Cheers

Sorry forgot to answer your other question. I originally had the car tuned when I had the CAI installed as I wasn't going to do anything else to it.:doh:

Since then I've added the hsv headers, cats and catback. Car feels ok but its going to Chev's on Moday for a service so I will ask him to give it a touch up tune as well. See if it makes a difference.

[SSVHM2.5]

Thanks for the info Eddie. Let us know how you go with the touch up tune.

[Thunder]

The engine light takes a while to come on.

[Tre-Cool]

i purchased some magnaflows for my ve so i could put some cats back on. after a week of driving the substrate has come loose. cant hear them rattle, but u can move them.

[Thunder]

i purchased some magnaflows for my ve so i could put some cats back on. after a week of driving the substrate has come loose. cant hear them rattle, but u can move them.

Keep an eye on the back of them.
The substrate is like thick alfoil, so it bends out of shape, and doesn't rattle like the standard ceramic type.
When you accelerate it pushes the substrate backwards.
Each time the substrate moves back, it domes the outer cells and closes them.
Over a period of time, the substrate will form the shape of the taper and will only be flowing through the centre holes.
This same problem happens with a number of different brands, but because they aren't noisy, many go un-noticed.

Cheers
Greg

[EddieVE06]

i purchased some magnaflows for my ve so i could put some cats back on. after a week of driving the substrate has come loose. cant hear them rattle, but u can move them.

Thats not good. Part of the reason I'm on here is that there are people in the know that can help and I'm glad I took the advice of some to maybe reconsider the magnaflow cats. Not saying they are bad but after I considered the reasoning behind it I'm glad I did. I'm not sure how these Venom cats will go but there are a few people running them on this forum and also a few people XR6 and G6E Turbos running them with increased boost and so far no problems.

I believe the substrate, as well as being bonded to the cat body, is welded along the inner edges. I weighed the cats and each cat weight 1.6kg, the fitter mentioned they were quite heavy.

http://i1120.photobucket.com/albums/l497/scalpfamily/20120922_154210_zpsf77d77f2.jpg
http://i1120.photobucket.com/albums/l497/scalpfamily/20120922_154437_zps655f6e87.jpg
http://i1120.photobucket.com/albums/l497/scalpfamily/20120922_154458_zpsc65c9f1d.jpg