Exotic-metal55

HadiLaw donated his mid pipe, cats and resonator for me to check out.. I wanted to use the cats for my mid pipe but did not work out.. My 3" mid pipe, with X is pictured below (still in the works)..Two magnaflow race cats will be in the front at 3lbs each, as I recall.. This will make the whole mid pipe weigh in at a svelte 21lb or 15 with off road set up!

The E55 mid pipe after the cats and between the resonator, is only around 2.5" to my suprise, even though most the pipes are 2.75.. This section of pipe , cats and resonator weighs 40lbs!!! Does not count the large primary cats either..

Last, I have seen several post on a rumor that the resonator has an X built into it.. First the resonator has holes inside it and that would defeat the X purpose and second it only has a crossover tube in it and not an X..

Hope this helps with a visual and ways to desing your mid pipes of the future..

TopGun32

well.. I had the bug to get more sound.. and took my car to my cousin's muffler shop.

We took the 2nd cats out and placed 2.5" pipes and straight back to a generic 2.5 (dual) X cross over instead of the resonator. As noted, the 2.75 pipes is very rare for most vehicles. Magnaflow X pipes with 2.5 will work.

I was thinking of doing X cross over on the 2nd cats too.. but I left them as free flowing as possible.

The result, better sound and better initial throttle response. Also, at 70mph there is no drone. Only around 50 to 60 at lower revs.. but its very deep and not annoying.

Around town.. car sounds deep but not "throaty" like a mustang or vette. Just lower tone. ON the high rpm's its comes to life a bit more.

I would say... for those with just resonator removal..I would take the 2nd cats off too.

I'm pushing close to 480RWHP and I would say that this mod help specially when the supercharger is engaged around 2k rpms and above.

I do have 178mm pulley, so getting rid of more exhaust quicker should account for a small gain. The better throttle response is just icing.

Btw: no torque loss under 2k rpms.

Exotic-metal55

3" Magnaflow race cats came in today. Only 2 lb each and very compact.. Second pictures shows how light shines right through..

xcmndnfmd

We took the 2nd cats out and placed 2.5" pipes and straight back to a generic 2.5 (dual) X cross over instead of the resonator. As noted, the 2.75 pipes is very rare for most vehicles. Magnaflow X pipes with 2.5 will work.

Exotic-metal55

With 600 RWHP in the plans, going smaller than stock 2.75 would cause me to lose sleep.. I have 3" cats, custom 3" mid pipe and then will reluctantly reduce the mid pipe down into 2.75 stock tail section.. At least for now..

justans10

Wait, are those going to be your primary cats? If so, don't waste your time. I clogged a set in a few weeks at 600rwhp. Don't know exactly why, but the cats clogged and destroyed my rear O2 sensors when the material moved down the pipe. Gut them and get someone to tune the computer so you don't get a CEL from no cats.

shardul

iTrader: (1)

his post cat 02 sensors are already turned off

justans10

Sorry, late night. To be more specific, they were my primary cats and I had no secondaries. They completely clogged, resulting in a misfire in 3 cylinders (no motor damage thank god), and when we went to take out the O2 sensor behind the cats, they wouldn't unscrew. 45 minutes, a pair of channel locks, and a hammer later, they came out, and what we saw was almost hysterical. The clogged cat material had worked its way out of the cat, down the pipe, and physically dented the O2 sensor, which kept it from being able to be removed. They were magnaflows, look exactly the same as the OP's, were 3" on both sides, about 10 inches long (counting the flanges) maximum, and you could see through them. I am 99% sure that they are the same as the OP's, and I am trying to save him some headaches down the road.

OP, I am telling you, don't use these cats. Either leave the pipe alone, or gut the cats if you need to pass a visual inspection. Putting those cats in will lead to them clogging after awhile, and then you will be kicking yourself for doing it.

Exotic-metal55

I am guessing your clogged cats were on another car and not a S/C benz? An Extremely rich motor or a lot of blow will clog a cat and pressure will blow it out.. Also if cats are to far back, they will not get hot enough to burn off ..

I am running cats,,, as I want to be legal..Not because I have to be..

justans10

It was on an 06 E55 with a Renntech package 4+. The car had the cats close to the factory location on an aftermarket X-pipe, but up by the collectors, between the O2 sensors. The tune was a Renntech tune, so it wasn't like it was some BS tune. BOTH cats completely clogged. Those cats can simply not handle the car's gases. I'm just trying to save you a headache.

Thericker

(running 600+ rwhp on any DJ) I've been running some very similar looking 3" 300 cell cats as Primaries for about (2) months now mated up to stock location (SL600/65 has no 2ndary cats in stk form) New bungs added to work w/OEM O2's (Zero chk Engine lights) or problems so far & pushing ton of air w/my mods... I also use race gas frequently 100+ Oct, AFR set to 12-12.5

Hoping they last if not easily/cheaply replaceable, running kitty-free in CA is NOT an option.

Exotic-metal55

[QUOTE=Thericker;3840385
Hoping they last if not easily/cheaply replaceable, .[/QUOTE]

My thoughts too.

Rare for Texas racers to run cats but there is that Karma thing.. I also hate to stink up the Armani with raw gas waste..

justans10

That is better-suited to that appication. The cat that he has is more like a 100 cell count, and cannot handle what the stock catalytic converters can. Link to what I had. Can the OP confirm if this is the same?

http://www.car-sound.com/02product/d...niversal=59959

Edit:

I just realized I had the exhaust in the back of my truck. Pics of the carnage in a minute. BTW, the stock cats held up perfectly fine on the same exact tune.

Edit, pics:

Here, you can see where the cat material actually hit the rear O2 sensor:


Here, you can see how far the material actually moved down the pipe:


Over all view of the pipe with cats for comparison (Fedor Dezyn pipes with the Magnaflow cats fitted afterwards, let's not go there):


You should be able to see cat material in the shot, but since it went all the way down the pipe, there's nothing to see there:

Thericker

What cell count did you get? 200 @ least? still I think they'll be fine

Exotic-metal55

The cats below are what I purchased. Conflicting info on the cell count.. 200 to 300 count is what I have seen for this part #.. Most likely they are 200 cell. They list for 95 each on most sites but I scored then for 66.00 each.. Like you said; they clog, they get changed.. Air filters cost almost that much..

http://www.car-sound.com/02product/d...niversal=59959

The above cats may have failed from having a stock 2" inlet pipe going into the cat? They are designed for 3" in and 3" out.. 2" in, may have put to much pressure in the center of the cat under large HP?

Thericker

I got these cheapos off the "Bay" about same price $64.99 ea you paid, they come in 3" in/out on request
http://cgi.ebay.com/ebaymotors/Thund...Q5fAccessories

macarena78

Magnaflow 2'5" downpipes and x pipe works on mercedes e55 amg???

HeissRod

That's a big downpipe!

macarena78

So? Can i put magnaglow 2'5" downpipe and x pipe in my mercedes e55 amg w211?

HeissRod

I'm messing with you. 2'5" = 2 feet 5 inches. I assume you mean 2.5" or two and a half inches.

macarena78

yes sorry, i meant 2.5"
magnaflow says they are for ford mustang 4.6 v8
can i put this downpipe and midle x pipe in my e55?
thanks!!

macarena78

hi, i would like to know if that magnaflow downpipe and xpipe fits in mercedes e55 amg.
can you tell me please?
thanks
regards

Denroll

Are you buying the cake? The cake for this thread's 5th birthday party coming up next month.

macarena78

Sorry??????