cmn130

I have been thinking about removing the catts. i have removed them alot of times on other cars and have seen good results. Has anyone takin there e55s to a muffler shop and had them removed ?

what kind of results ?

more hp? better tone?

My car is bone stock, I have a friend taking his lexus isf to remove his cats tomorrow I kind of want to go as long as the result will be positive

thanks

TheVazha

Dont do it. Just use the $ you would spend on removing cats and res to buy a proper set of mufflers like Eisenmann or Meisterchaft.

Forrest Gump 9

I removed both primaries and secondaries cats for the whole TWO DAYS. I can't comment on the gains because I got my headers install at the same time. But the smell alone was enough to make me put a set of hi-flow cats back in. So hi-flow cats would be my choice. Hope that help you.

cmn130

well i was just hopping for a little power gain for cheap. i have a friend there that will do it for 50 bucks. not looking to spend 1500 right now on exhaust my pockets arnt that deep at the moment.

KLR CLS

I would do secondaries at most. Benz Addict has both sets removed and it smells like a diesel refinery when drving behind him. I am also convinced it doesn't add much performance and definately takes away low end tq.

guysandiego

i dont think taking them all out is the answer -- my friend did that and i think it hurt him a little --- also, it smells like gas .

I took out my 2nds and i think it is a great compromise -- get more sound and a little hp--- probably helps with mpg. but you will not get alot of sound !!! take out the 2nds and the resonator at the same time -- it will not be loud at all -- only way to get big sound is if you change the mufflers or if you go straight headers to the mufflers -- my friend did that and sounds perfect -- still quiet at idle --- a little growl at light load -- and a monster at WOT

AgSilver

Do not think for a moment that the CATS on an E55 are randomly located. Rarefaction pulse calculations indicate that these CATS are precisely located to generate a proper pulse. Remove them and you will lose power.

skratch77

Now you guys are scaring me.I just bought kleemann headers and it comes with downpipes to delete the cats and an ecu tune to clear the check engine light.

Im keeping the secondaires to help with smell.

If amg designed our exhaust a special way to make power than why did they use the same manifolds as an e500 that isnt even supercharged.

930chas

You will be fine. Real nice gains with the Kleemans and the primary cat removal, have heard 7-10hp gain from just removing the primaries. Proceed as planned and enjoy your new power!

cmn130

Well this is really bad news I have never owned a car that looses hp from removing the cats. The isf only lost by half a car to me. He gains 20 hp from his cat removal, after that he may get the edge he needs to take me. My brother has a clk he gained 20 hp removing cats.

Exotic-metal55

Leave the cats, stay legal, don`t stink up the Armani suits! Headers will do everything these cars need..

Changing muffler`s is a Joke!!!

Infiniti

IS-F only lost by a half a car? thats a joke man. I look at them things drive by me and i laugh. Dyno your car or take it to the track.

cmn130

well it was mid day, my car is stock. im wondering if it ran bad since its 92 outside , i didnt feel the blower turn off, but im wondering if the pump mod needs to be done. I am actually shocked he was so close. and honestly from a higher mph i think he could take me.

its looking like secondary cats and res deletes are ok from some people I may try them worst case I can have them put back on.

Ali_E55

removing them with disabling the O2 and a TUNE is a MUST for gains, if u will not tune it, then don't remove them. they restrict alot of power & generate heat due to back pressure.

cmn130

r u talking about secondary or primary. cause everyone that has removed secondary with res has said they dont need tuning .

Infiniti

save your fifty bucks and buy a pump. like someone else said if your car from first with the traction off just does a lil chirp or little spin and then takes off its bad, if it looks like a NHRA event then its good. my car is stock to and the first thing i did was the pump. i then recommend you to do the idler pulley bearing for 5 bucks. also each pep boys has atleast one knn in stock, so do that to. my car is stock and i'd roast a IS-F

cmn130

well my car does chirp the tires and smoke them with esp off. the car was neck and neck with a c6 corvette. Im not sure how the isf was so close except maybe mid day heat vs when I ran the vette was at night so maybe cooler?

the pump only has turned off on me after like 3-4 back to back hard runs.

if I can spend 50 bucks and pick up a little hp and a little bit more sound id do it.

Infiniti

if the pump is turning off after 3-4 hard runs its toast my brother. my car was doing the same thing i changed it and its

cmn130

u think its faster on the 1st and 2nd runs? or just when it gets hot it turns off. im just having trouble figuring out how he was so close.

Also, on another note, do k&n filters do anything for our cars? im trying to do inexpensive mods fist

Jakpro1

If you are gonna do this, wish you could dyno before and after. I would LOVE to see if this makes any difference.

I don't think you are gonna feel one bit of difference with just cat only but who knows.

Hate to have you do this and end up with CEL when the O2 picks up cat removal .

cmn130

well I took the car to the muffler shop today, they wanted 200 to remove secondary cats and resos a little more then what i thought it was worth. I may try another place early next week. Its a weird looking setup under the car though.

still curious if the k&N filters make a difference or not..

guysandiego

thats not a bad price -- it will be great if they include an X-pipe for that price. K&N filters will only help a little bit -- I recommend changing them when its time to replace the OEMs --- remember it is difficult to feel +10-20hp on a 500hp car.

i say- just take out the 2nds and resonator -- maybe put an H or X pipe in place of the resonator -- You will be happy -- I really doubt you will regret it.

cmn130

well they quoted my friend with half the work of my car 150, We are going to try one more place on tues. so you think this will help my car? and im only looking for a little hp before i save up and do tune and pully.

skratch77

before you go cutting up your car just want you to know that it will throw codes and not pass inspection if your in an area that plugs into the car.
'
You will need a tune to delete the rear 02s or lower there voltages

the most restrictive parts of the e55 exhaust are not the cats,its the tiny log manifolds that use as headers!!!

I am going to run the kleemann headers and keep the cats and throw her on the dyno,If I pick up 20whp im keeping the cats on the car.

cmn130

lol everyone has a diff story. some say to do it, some say dont. some say they throw codes some dont. im so confused. im not spending 2k pluss labor on headers right now. the first thing im going to do is tune and pully. I figured for 100 bucks or so it would be interesting to change up the exhaust tone.