08-05-2007, 12:01 PM
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#1
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Registered User
Join Date: Jul 2007
Location: Sydney
Posts: 150
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Schnell Headers on 986 with Stock Exhaust
Hi fellow Boxster owners
Im about to purchase a set of Schnell exhaust manifold for my 2000 Boxster S, mainly for the purpose of sound but Im wondering if it would give actual performance gains with the stock exhaust system in place?
Two reasons that I have chosen Schnell, 1: cheapest I can find (please link me if you know a better/cheaper product. 2: being a 2000 boxster s it doesnt have any cats near the manifold, fabspeed offers a set of headers with cats for double the price which i dont think i needed them.
Please share your thoughts.
Last edited by panameras; 08-05-2007 at 06:13 PM.
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08-05-2007, 12:28 PM
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#2
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Registered User
Join Date: Dec 2006
Location: Mechanicsville, VA
Posts: 239
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I would think you would get a performance gain and sound gain from any brand out there from what I have read. The Porsche OEM headers on 2000 up cars have 4 cats. 2 integrated in the headers and 2 further back.
I have seen the fabspeed online and looks like a great system, but expensive as you mention. I also have interest in the maxspeed motorsports headers on ebay which are the only ones I have seen in that price range with 4 O2 bungs in them for the oxygen sensors.
From what I have read and talked with my local Pcar indie shop, you can expect 10-15 HP gain from headers depending...
Anything is better than the horribly designed system from Porsche. Another "keep the Boxster below the 911 in performance" design.
Let us know what you go with and how you feel about the change. I feel that is the next mod I will be doing to my car.
__________________
Jeff Wilson
1989 911 Cabriolet
Grand Prix White/Black
33k
Stock except:
Turbo 7x9 Fuchs
SOLD!
2002 986S
Seal Gray/Black
Painted Center Console
18" Turbo Twists with rear spacers
Tequipment aluminum shift knob
Colored center caps
De-ambered tail lights/side markers
Stock except:
B&B catback exhaust
http://i29.tinypic.com/i6crck.jpg
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08-06-2007, 02:36 AM
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#3
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Registered User
Join Date: Jul 2007
Location: Sydney
Posts: 150
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Thats weird I could only see two cats in my system, unless (see pic) that tiny pipe with a oxygen plug on top is the one of the second set of cats. There definitely no cats intergrated with the headers. If not I guess an possible explaination would be although my is classified as 2000 model but it actually was built in 99 (as what it says on the built plate).
Any more info on the maxspeed motorsports headers you mentioned?
Last edited by panameras; 08-06-2007 at 02:44 AM.
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08-06-2007, 09:06 AM
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#4
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Registered User
Join Date: Jul 2006
Location: Virginia
Posts: 916
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I only picked up 6hp at the wheels on my 2.7L 2000 Boxster based on a before and after dyno runs when I added headers and a single pair of 100-cell cats (replacing the two stock pairs). A small hp gain, especially for the cost, but, boy does it sound sweet....
Ed
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My Car Webpage
2000 2.7L Boxster 102K; TTP intake, headers, high-flow cats; Dansk high-flow muffler; Autothority ECU chip; TechnoTorque 2; Bilstein coilovers; Racing Dynamics strut brace; stress-bar suspension kit; Aasco lightweight flywheel, B&M short shiftkit; 18" wheels; spare tire delete; OEM GT3 seats; JL audio speakers and subwoofer; Alpine PDX-5/PDX-2 amps; Kenwood DNX8120 CD/DVD/Nav; litronics, deambered
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08-06-2007, 12:50 PM
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#5
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Registered User
Join Date: Nov 2003
Location: Illinois
Posts: 3,033
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Panameras, the stock system on 200-2004 boxsters looks like the one on the left.
It looks like the manifolds are missing in the pic you provided!! Maybe it's just the angle....take a pic of the underside of the engine!!
Last edited by Adam; 08-06-2007 at 12:53 PM.
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08-06-2007, 01:28 PM
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#6
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Registered User
Join Date: Dec 2006
Location: Mechanicsville, VA
Posts: 239
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A pic is attached of the stock headers with horrible merge collector and integrated cat converter.
You can see the 4 O2 bungs (2 precat, 2 postcat) I have referenced. The problem is extending the wires of the 2 precat O2 sensors so that they are now 4 postcat O2 sensors in order to not have CEL's when you install new headers that remove this terrible OEM design. I want to check with my local Pcar Dealer to ask his thoughts. I want to keep all O2 sensors if possible.
Maybe some other guys have done this successfully already?
__________________
Jeff Wilson
1989 911 Cabriolet
Grand Prix White/Black
33k
Stock except:
Turbo 7x9 Fuchs
SOLD!
2002 986S
Seal Gray/Black
Painted Center Console
18" Turbo Twists with rear spacers
Tequipment aluminum shift knob
Colored center caps
De-ambered tail lights/side markers
Stock except:
B&B catback exhaust
http://i29.tinypic.com/i6crck.jpg
Last edited by jwilson95; 08-06-2007 at 01:43 PM.
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08-07-2007, 09:05 AM
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#7
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Registered User
Join Date: Jul 2007
Location: Sydney
Posts: 150
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Quote:
Originally Posted by Adam
Panameras, the stock system on 200-2004 boxsters looks like the one on the left.
It looks like the manifolds are missing in the pic you provided!! Maybe it's just the angle....take a pic of the underside of the engine!!
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Adam, is that the Fabspeed muffler? how does it sound any drone?
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08-08-2007, 12:13 AM
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#8
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Registered User
Join Date: May 2006
Location: North West,UK
Posts: 123
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For reference attached is the picture of the OEM header I removed.
Thanks
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08-08-2007, 04:22 AM
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#9
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Registered User
Join Date: Nov 2003
Location: Illinois
Posts: 3,033
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Quote:
Originally Posted by noone986s
For reference attached is the picture of the OEM header I removed.
Thanks
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That's the same exhaust manifold the 2.5L cars have. It looks like you were correct in assuming the non-US 2000-2004 cars are different.
Last edited by Adam; 08-08-2007 at 04:24 AM.
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08-10-2007, 01:12 AM
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#10
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Registered User
Join Date: May 2006
Location: North West,UK
Posts: 123
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You could install these electric ones.....
http://www.badlanzhpe.com/index.html
.....and then get a cheap shift light circuit from ebay, hack it and use the ouput of that to drive a relay circuit (rather than lighting the shift light) and you could have a configurable exhaust valve.
If you could have the valves opening into bypass pipes then I think you could be on to a winner. I am not 100% on the sound but like the idea.
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08-11-2007, 06:39 AM
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#11
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Registered User
Join Date: Jan 2007
Location: Depends on the day of the week....
Posts: 1,400
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That could be one way of doing this, though I am thinking of a more progressive opening, over say, a 1000 RPM from beginning to open to fully open, rather than just a hard RPM point from open/close.
There needs to be a bit more engineering put into this, perhaps it will become a winter project.
Patrick
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08-14-2007, 04:24 AM
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#12
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Registered User
Join Date: Jul 2007
Location: Sydney
Posts: 150
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Just put my order through for a set of Maxspeed headers. Will dyno it afterwards to see how they perform on my 3.2.
Baseline was 168rwkw on a very hot day.
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08-15-2007, 03:34 PM
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#13
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Registered User
Join Date: Jul 2006
Location: Shawnee, KS
Posts: 159
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good choice!!!
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08-15-2007, 06:34 PM
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#14
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Registered User
Join Date: Dec 2006
Location: Mechanicsville, VA
Posts: 239
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Hey Panameras-
Please update us on the results from a HP gain and sound/feel perspective. I talked to my local pcar mechanic and his basic answer to me was, "WHY?". You're not going to gain much HP and going to be throwing CEL codes all over the place. Our situations are different because of the integrated cat in my headers. I think I'd be much more likely to do it if we had the Euro headers here with only 2 cats.
Good luck and hope you like them.
__________________
Jeff Wilson
1989 911 Cabriolet
Grand Prix White/Black
33k
Stock except:
Turbo 7x9 Fuchs
SOLD!
2002 986S
Seal Gray/Black
Painted Center Console
18" Turbo Twists with rear spacers
Tequipment aluminum shift knob
Colored center caps
De-ambered tail lights/side markers
Stock except:
B&B catback exhaust
http://i29.tinypic.com/i6crck.jpg
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