Long tube headers ,what is the HP gain with out removing CATs
Thread Starter
Senior Member
Joined: Mar 2012
Posts: 325
Likes: 3
From: SF Bay Area
08 E63 AMG
Long tube headers ,what is the HP gain with out removing CATs
Hi guys ~
Just wondering typical Long tube headers due to their length , you have to
remove the primary cat and secondary cat and stock H pipe.
Increased HP installing LT headers. But what is the HP increase if CATS
are not removed?? Maybe with sport CATs or something?
This whole HP increase is not just from removing the CATS right ?
Just wondering typical Long tube headers due to their length , you have to
remove the primary cat and secondary cat and stock H pipe.
Increased HP installing LT headers. But what is the HP increase if CATS
are not removed?? Maybe with sport CATs or something?
This whole HP increase is not just from removing the CATS right ?
Super Member
Joined: Mar 2009
Posts: 937
Likes: 15
From: Alpharetta Georgia
2006 E55, 2006 saab 93 aero, 2010 glk 4m
The bulk of the gain is from having larger primaries(runners), the collector being furthur down (helps extraction) and the elimination of the primary cats. I just don't see the secondaries causing much of a restriction especially when it comes to race cats. Of course I don't have before and after dynos to prove my theory but I can't for-see anything more than a 5whp difference with quality cats, if even that at all.
Thread Starter
Senior Member
Joined: Mar 2012
Posts: 325
Likes: 3
From: SF Bay Area
08 E63 AMG
The bulk of the gain is from having larger primaries(runners), the collector being furthur down (helps extraction) and the elimination of the primary cats. I just don't see the secondaries causing much of a restriction especially when it comes to race cats. Of course I don't have before and after dynos to prove my theory but I can't for-see anything more than a 5whp difference with quality cats, if even that at all.
Hey Guys thanks for all the info ~!! I see that most of after market set ups
are Long tube headers with X pipe and end muffler. I was told that X pipe
is best when located close to the headers as possible. If I'm going to delete
the primary cats ~ Do you think its best to place the X pipes at where
primary cat goes in and then place just straight pipe where stock resonator
goes in ???
wow 40 rwhp???? Damn .!! My first performance tunes gonna be headers !!
do you think I should do the ECU at the same time or is it ok to do it later??
Cuz I dont think I have enough cash after headers + installation .
MBWorld Fanatic!
Joined: Jun 2009
Posts: 1,693
Likes: 9
From: Houston, TX
2006 E55, 2012 Jeep SRT, 2008 G37s 6MT (The Mrs.), 2005 Explorer
If I were to do it all over again I would have done headers as a first mod. 40+whp and lower IATs.
Looks at this link:
https://mbworld.org/forums/w211-amg/...ders-must.html
This is why headers are worth 40+whp on these cars. It's perfectly safe to run your stock ECU with headers. They way the car is setup you'll have to put the X-pipe some what back in the system. There's simply not room to have it super close to the LT's collectors.
Here's some pics and vids of my set-up.
http://s1113.photobucket.com/albums/...erlingE55/E55/
Anything is leaps and bounds an improvement over stock.
Looks at this link:
https://mbworld.org/forums/w211-amg/...ders-must.html
This is why headers are worth 40+whp on these cars. It's perfectly safe to run your stock ECU with headers. They way the car is setup you'll have to put the X-pipe some what back in the system. There's simply not room to have it super close to the LT's collectors.
Here's some pics and vids of my set-up.
http://s1113.photobucket.com/albums/...erlingE55/E55/
Anything is leaps and bounds an improvement over stock.
Thread Starter
Senior Member
Joined: Mar 2012
Posts: 325
Likes: 3
From: SF Bay Area
08 E63 AMG
If I were to do it all over again I would have done headers as a first mod. 40+whp and lower IATs.
Looks at this link:
https://mbworld.org/forums/w211-amg/...ders-must.html
This is why headers are worth 40+whp on these cars. It's perfectly safe to run your stock ECU with headers. They way the car is setup you'll have to put the X-pipe some what back in the system. There's simply not room to have it super close to the LT's collectors.
Here's some pics and vids of my set-up.
http://s1113.photobucket.com/albums/...erlingE55/E55/
Anything is leaps and bounds an improvement over stock.
Looks at this link:
https://mbworld.org/forums/w211-amg/...ders-must.html
This is why headers are worth 40+whp on these cars. It's perfectly safe to run your stock ECU with headers. They way the car is setup you'll have to put the X-pipe some what back in the system. There's simply not room to have it super close to the LT's collectors.
Here's some pics and vids of my set-up.
http://s1113.photobucket.com/albums/...erlingE55/E55/
Anything is leaps and bounds an improvement over stock.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 7,659
Likes: 67
From: Atlanta
2006 E55 AMG
He does have an E63 not an E55, but a buddy of mine just installed MBH headers with an x pipe, and the car picked up over 40rwhp. If you delete or leave the secondary cats in place, it will not make much of a difference, less than 5rwhp.
I would recomend removing that factory mid pipe, and have a nice x or h pipe made or you could buy MBH's full exhaust back to the catbak. They guarentee 42rwhp or your money back, that is major right there brotha!
Another great product is American Racing Headers, major gains and top notch product.
I would recomend removing that factory mid pipe, and have a nice x or h pipe made or you could buy MBH's full exhaust back to the catbak. They guarentee 42rwhp or your money back, that is major right there brotha!
Another great product is American Racing Headers, major gains and top notch product.
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Thread Starter
Senior Member
Joined: Mar 2012
Posts: 325
Likes: 3
From: SF Bay Area
08 E63 AMG
He does have an E63 not an E55, but a buddy of mine just installed MBH headers with an x pipe, and the car picked up over 40rwhp. If you delete or leave the secondary cats in place, it will not make much of a difference, less than 5rwhp.
I would recomend removing that factory mid pipe, and have a nice x or h pipe made or you could buy MBH's full exhaust back to the catbak. They guarentee 42rwhp or your money back, that is major right there brotha!
Another great product is American Racing Headers, major gains and top notch product.
I would recomend removing that factory mid pipe, and have a nice x or h pipe made or you could buy MBH's full exhaust back to the catbak. They guarentee 42rwhp or your money back, that is major right there brotha!
Another great product is American Racing Headers, major gains and top notch product.
I will check them out as well. I heard their price is a bit more competitive
than the others. So headers that are available for E63 are
MHP , American Racing , EVOSPORT, Keelmann, Agency Power
those are about it right ?
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MBWorld Fanatic!
Joined: Jun 2009
Posts: 1,693
Likes: 9
From: Houston, TX
2006 E55, 2012 Jeep SRT, 2008 G37s 6MT (The Mrs.), 2005 Explorer
He does have an E63 not an E55, but a buddy of mine just installed MBH headers with an x pipe, and the car picked up over 40rwhp. If you delete or leave the secondary cats in place, it will not make much of a difference, less than 5rwhp.
I would recomend removing that factory mid pipe, and have a nice x or h pipe made or you could buy MBH's full exhaust back to the catbak. They guarentee 42rwhp or your money back, that is major right there brotha!
Another great product is American Racing Headers, major gains and top notch product.
I would recomend removing that factory mid pipe, and have a nice x or h pipe made or you could buy MBH's full exhaust back to the catbak. They guarentee 42rwhp or your money back, that is major right there brotha!
Another great product is American Racing Headers, major gains and top notch product.
