Question on High Flow Cats

Dec 11, 2009 | 09:09 AM

alextaylor29

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From: Queen Creek AZ

2004 E55 AMG

Question on High Flow Cats

Gents,

With the below mods, will installing high flow cats get me any HP/TQ gain or are they more for E55's that are pushing more HP?

Johnson Pump
Eurocharged Heat Exchanger
Let Stage 1 tune
K&N's

Everything else is stock on my car. Should I hold off on cats until I do the pulley, headers, etc, or would I see some more HP with these and my existing (above) mods?

Link to the mod: http://www.eurocharged.com/index.php...mart&Itemid=99

Thanks!

Alex

Dec 11, 2009 | 09:29 AM

MRAMG1

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Joined: Jan 2007

Posts: 3,342

Likes: 11

From: PA

S600, GL450, GLC 43

Quote:

Originally Posted by alextaylor29

Gents,

With the below mods, will installing high flow cats get me any HP/TQ gain or are they more for E55's that are pushing more HP?

Johnson Pump
Eurocharged Heat Exchanger
Let Stage 1 tune
K&N's

Everything else is stock on my car. Should I hold off on cats until I do the pulley, headers, etc, or would I see some more HP with these and my existing (above) mods?

Link to the mod: http://www.eurocharged.com/index.php...mart&Itemid=99

Thanks!

Alex

In a word YES. It is HOGHLY doubtful you will see ANY gains from the cats themselves as the stockers are really quite good. After a pulley and some long tubes well then the answer is a definitive YES you will see some gains. Just don't hope for 20-30 HP here as some of the fastest cars here have stock cats.

Happy holidays

Dec 11, 2009 | 11:00 AM

alextaylor29

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Joined: Oct 2009

Posts: 1,097

Likes: 1

From: Queen Creek AZ

2004 E55 AMG

Perfect, thanks!

Dec 11, 2009 | 11:26 AM

Full Throttle

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Joined: May 2009

Posts: 971

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From: D.C. METRO AREA

CLS55 AMG

Quote:

Originally Posted by alextaylor29

Gents,

With the below mods, will installing high flow cats get me any HP/TQ gain or are they more for E55's that are pushing more HP?

Johnson Pump
Eurocharged Heat Exchanger
Let Stage 1 tune
K&N's

Anything that reduces intake and exhaust restriction will add power.

Dec 11, 2009 | 12:08 PM

X2Board

Super Member

Joined: Aug 2009

Posts: 697

Likes: 1

From: Tar Heel State

His wife crazy

Quote:

Originally Posted by Full Throttle

Anything that reduces intake and exhaust restriction will add power.

Drive around for a few weeks with no air filters and let me know if you feel a difference

JK!

Dec 11, 2009 | 12:14 PM

Exotic-metal55

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Joined: Jun 2008

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Likes: 65

From: Texas

2003 CL55

Quote:

Originally Posted by alextaylor29

Gents,

With the below mods, will installing high flow cats get me any HP/TQ gain or are they more for E55's that are pushing more HP?

Johnson Pump
Eurocharged Heat Exchanger
Let Stage 1 tune
K&N's

One option for now, would be to just remove the rear cats .. Later when you add headers (and you will), then spend the money on Race cats.. You can replace rear cats with X pipe , straight or repalce rear resonator with X pipe.. Severla easy options..

__________________

E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.

CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.

www.ultimatepd.com
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facebook.com/ultimatepd

Dec 11, 2009 | 01:26 PM

alextaylor29

Thread Starter

MBWorld Fanatic!

Joined: Oct 2009

Posts: 1,097

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From: Queen Creek AZ

2004 E55 AMG

Gotcha, thanks again guys. Currently I'm looking just at pure HP/TQ gain mods and I'm trying to do this in a logical/sequencial manner.

So in order:

1. Filters - Done
2. IC Pump - Done
3. Upgraded HE (I live in Phoenix AZ, so this is key) - Later this month
4. Let Stage 1 tune - next week
5. Pulley(s) - early next year
6. Etc..

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Dec 11, 2009 | 03:27 PM

MRAMG1

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Joined: Jan 2007

Posts: 3,342

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From: PA

S600, GL450, GLC 43

Quote:

Originally Posted by Full Throttle

Anything that reduces intake and exhaust restriction will add power.

Although this is a generally true statement. At stock or near stock levels, the factory cats DO NOT restrict airflow.

Please feel free to ask MANY of the draggers here that hold MANY of the records on dragtimes,com.

To put on HI flow cats on a relatively stock 55 is a waste of money, period.

Dec 11, 2009 | 05:07 PM

#10

Exotic-metal55

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Joined: Jun 2008

Posts: 3,834

Likes: 65

From: Texas

2003 CL55

Once the first mod starts, it never stops. Plan for the future and always build your mods around doing more. If you don`t, as the mod virus hits, you will just keep re-doing and exapnding what you didn`t do right in the first place..

This waste $$$$$$.

Here is a mid pipe that I just built to go onto headers, with race cats. Never touched my stock AMG exh., until it was ready to replace it fully. Was tempted many times to franken hack it up to gain a few ponies but experience says to fight the mod virus and do it right !!

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Dec 11, 2009 | 05:17 PM

#11

Full Throttle

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Joined: May 2009

Posts: 971

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From: D.C. METRO AREA

CLS55 AMG

Quote:

Originally Posted by MRAMG1

the factory cats DO NOT restrict airflow.

Did you just say catalytic converters do not restrict exhaust flow. You're not serious are you???

Dec 11, 2009 | 06:09 PM

#12

MRAMG1

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Joined: Jan 2007

Posts: 3,342

Likes: 11

From: PA

S600, GL450, GLC 43

Quote:

Originally Posted by Full Throttle

Did you just say catalytic converters do not restrict exhaust flow. You're not serious are you???

In a word YES. There have been NO appreciable documented gains on several C32's and E55's that were stock from removing their cats. At least according to their dyno sheets. I will concede you 3-6 HP. For the money, its not worth it.

In a modified car, again referring to my previous remark on your statement, YES it will show tangible gains.

Even a lonely little Ford Mustang, 88-93 sees NO gains from changing out the cats or mufflers until its making over 270 HP.

Dec 11, 2009 | 08:52 PM

#13

alextaylor29

Thread Starter

MBWorld Fanatic!

Joined: Oct 2009

Posts: 1,097

Likes: 1

From: Queen Creek AZ

2004 E55 AMG

Completely agreed, thanks guys. While this is my first MB, I've owned high HP cars before so I understand the dynamics here. I was only curious as, for the $$$, it's a pretty inexpensive mod. But with no real HP gains, given my mostly stock E55, I will hold off on those.

Again thank you, you saved me from wasting $$ at this moment.

Alex