Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 08-02-2008, 02:39 PM   #1
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Best Headers for 2002 3.6L in Boxster

What is the best header that will fit in a 2002 Boxster S with a 2002 996 3.6L? performance is the goal and past emissions. Is the SCargo the best? money is also a factor too.
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-02-2008, 04:08 PM   #2
Registered User
 
Join Date: Nov 2003
Location: Illinois
Posts: 3,033
Quote:
Originally Posted by m2speed
What is the best header that will fit in a 2002 Boxster S with a 2002 996 3.6L? performance is the goal and past emissions. Is the SCargo the best? money is also a factor too.
Fabspeed headers are the best.
__________________
'03 3.2L GuardsRed/Blk/Blk---6Spd
Options: Litronics, 18" Carrera lights, Bose sound, Painted to match roll bars.
http://i100.photobucket.com/albums/m...Mautocross.jpg
Adam is offline   Reply With Quote
Old 08-03-2008, 12:12 AM   #3
Registered User
 
Join Date: Jul 2006
Location: lex
Posts: 213
Thats a difficult question... ideally since you are running .4 more liters, you would want headers bigger than those made for a 3.2 or 2.7... but 996 headers do not fit under a Boxster... so just find the biggest you can.... BUT you want to pass emissions... thats a whole other can of worms which would start with does your state check emissions? or do they rely on the OBC? do you want to run your secondary cats? etc etc... that answer can be searched on here...
__________________
Lexington, KY Go CATS!
http://i187.photobucket.com/albums/x...s/DSCN0406.jpg
2001 986S... 3.6 swap (yep 7.2->7.8), PSS9's, GT3 seats, OEM 986 Carrera 5-spokes, and much more http://i187.photobucket.com/albums/x...me/burnout.gif
1987 928 S4 white on red and... dead
2004 Chevy Surburban... drinks gas like its cheap or something
easyc is offline   Reply With Quote
Old 08-03-2008, 12:23 AM   #4
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Quote:
Originally Posted by easyc
Thats a difficult question... ideally since you are running .4 more liters, you would want headers bigger than those made for a 3.2 or 2.7... but 996 headers do not fit under a Boxster... so just find the biggest you can.... BUT you want to pass emissions... thats a whole other can of worms which would start with does your state check emissions? or do they rely on the OBC? do you want to run your secondary cats? etc etc... that answer can be searched on here...
Well you made a very good point about missions. In Austin they only check for codes on OBD II cars. Older ones they do the sniff test. I think that is correct anyway. If so I could forgo the secondary cats and use thoses bypass sensor adaptors too keep the trouble codes away.
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-03-2008, 09:18 AM   #5
Registered User
 
Join Date: Jan 2006
Location: Glen Allen, ON
Posts: 312
Any header made for a 986 is too small for the 3.6. With the 3.6 Porsche enlarged the exhaust ports size significantly. Previously the 996 3.4 and 986 engines used the same size exhaust ports so using a set of 3.2S performance headers was a good solution. Not so with the 3.6 and 3.8 swaps. This obviously ignores the primary size and length, which are also wrong for a 3.6 on the 986 based headers.

-Todd
__________________
Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
tholyoak is offline   Reply With Quote
Old 08-03-2008, 12:51 PM   #6
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Quote:
Originally Posted by tholyoak
Any header made for a 986 is too small for the 3.6. With the 3.6 Porsche enlarged the exhaust ports size significantly. Previously the 996 3.4 and 986 engines used the same size exhaust ports so using a set of 3.2S performance headers was a good solution. Not so with the 3.6 and 3.8 swaps. This obviously ignores the primary size and length, which are also wrong for a 3.6 on the 986 based headers.

-Todd
So what is the solution? Does anyone make a good header for the 3.6L to 3.8L in a 986?
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-03-2008, 03:03 PM   #7
Registered User
 
Join Date: Jul 2006
Location: lex
Posts: 213
Im using a set of the Maxspeed/ Schnell type... they had the largest diameter I could find plus O2 bungs.... until I get a custom set made OR crack them they will have to do
__________________
Lexington, KY Go CATS!
http://i187.photobucket.com/albums/x...s/DSCN0406.jpg
2001 986S... 3.6 swap (yep 7.2->7.8), PSS9's, GT3 seats, OEM 986 Carrera 5-spokes, and much more http://i187.photobucket.com/albums/x...me/burnout.gif
1987 928 S4 white on red and... dead
2004 Chevy Surburban... drinks gas like its cheap or something
easyc is offline   Reply With Quote
Old 08-03-2008, 04:11 PM   #8
Registered User
 
Join Date: Jan 2006
Location: Glen Allen, ON
Posts: 312
Top is gasket for a 3.6L engine, bottom is 986 Boxster/996 3.4 gasket. As you can see, you aren't doing your engine any favours by running 986 headers on a 3.6L engine.


-Todd
__________________
Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
tholyoak is offline   Reply With Quote
Old 08-03-2008, 04:35 PM   #9
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Quote:
Originally Posted by tholyoak
Top is gasket for a 3.6L engine, bottom is 986 Boxster/996 3.4 gasket. As you can see, you aren't doing your engine any favours by running 986 headers on a 3.6L engine.


-Todd
What header are you using? Maxspeed has one with sports cats and one without that they state are a good fit for the 3.6L conversions.
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-03-2008, 04:43 PM   #10
Registered User
 
Join Date: Apr 2008
Location: St. Marys, GA
Posts: 178
Seems like custum headers would be the expensive and right choice.
silver arrow is offline   Reply With Quote
Old 08-03-2008, 05:36 PM   #11
Registered User
 
Join Date: Jan 2007
Location: Depends on the day of the week....
Posts: 1,400
Todd is running some top secret creation of his own

The Maxspeed catted headers look like they'd flow horribly to me, not to mention I can't imagine that they were designed for the larger ports of a 3.6.

Patrick
Cloudsurfer is offline   Reply With Quote
Old 08-04-2008, 04:25 AM   #12
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Todd or whoever knows,

What is the width and height of the ports? trying to figure the size primary really needed for the 3.6L header. I have a tig welder and might have to do the custom thing. My 3.6L is coming UPS freight on Tuesday or Wednesday from Houston to Austin.

My 2002 3.2L engine will be for sell soon. 43K miles and runs perfect.

Jeff
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-04-2008, 06:26 AM   #13
Registered User
 
Join Date: Jan 2006
Location: Glen Allen, ON
Posts: 312
I agree with Patrick, those catted maxspeed headers look like not much thought went into designing them.

No need to go custom, come on guys do I have to spoon feed you everything

I have stated, you can't use 986 headers... what comes after 986... that's right headers designed for the 987, in particular the 3.4 in the Boxster or Cayman S. They have the right size ports and the primaries and collectors are pretty much the right sizes. The modifications needed to get them to work are minimal to none depending on the muffler and header choice.

Here is the Fabspeed on my car now, I also have a set of B&B. I am probably selling the B&B set if anyone is interested.



-Todd
__________________
Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
tholyoak is offline   Reply With Quote
Old 08-04-2008, 08:59 AM   #14
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Quote:
Originally Posted by tholyoak

Here is the Fabspeed on my car now, I also have a set of B&B. I am probably selling the B&B set if anyone is interested.



-Todd
What are the specs on the B & B headers and do they have cats? What price are you wanting? Also how do the specs of the Fabspeed compare to that of the B & B? Do you have pics of the B & B?
Jeff
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-04-2008, 12:35 PM   #15
Registered User
 
Join Date: Jul 2007
Location: Texarkana, Texas
Posts: 959
I think Todd is going to have the best advice hear seeing as he's actually done this engine swap. Thank you Todd for giving us the info, it is appreciated!

I'm just going to throw in my 2 cents... You might want to give Instant G a call. They specifically make an aftermarket exhaust system for the 3.4 L Boxster conversion. From their website it sounds like it's pretty oversized for the application, so it may work well for a 3.6L too. I'd ask them. Plus they may be willing to make something to fit your car as they appear to be a small, custom order type of operation. I think their 3.4L system is about $3,000 complete (headers, mid-pipes, and muffler), so it's not cheap, but the quality and design appear to be top notch.

Here's their main site:

http://www.instant-g.com/

And specific info about the 3.4L Boxster exhaust system:

http://www.instant-g.com/Products/Exhausts/Box34/index.html

Kirk
__________________
2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
Kirk is offline   Reply With Quote
Old 08-04-2008, 01:25 PM   #16
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Quote:
Originally Posted by Kirk
I think Todd is going to have the best advice hear seeing as he's actually done this engine swap. Thank you Todd for giving us the info, it is appreciated!

I'm just going to throw in my 2 cents... You might want to give Instant G a call. They specifically make an aftermarket exhaust system for the 3.4 L Boxster conversion. From their website it sounds like it's pretty oversized for the application, so it may work well for a 3.6L too. I'd ask them. Plus they may be willing to make something to fit your car as they appear to be a small, custom order type of operation. I think their 3.4L system is about $3,000 complete (headers, mid-pipes, and muffler), so it's not cheap, but the quality and design appear to be top notch.

Kirk
Looks good but not crazy about that flat triangle collector.

I called B & B about an hour ago. I asked about the Cayman header they sell as fitting the 986 w/ 3.6L He didnít think it would fit with out cutting it up and re-fabbing it. He thought that a custom set from scratch was the right answer if you have the equipment to do it. I do so I think Iím going that route.

He gave me the place where they buy their components to build stainless mandrel bent headers. They sell collectors, flanges and all the stuff to build a really quality set of headers. I would like the best size primary diameter and length to have it work as good as possible. They have many different high quality 3 into 1 collectors too. They sell 321 and 304 stainless parts. I have a mill, band saws, drill press, tig welder, torches, and other metal working tools to get it done.
Jeff
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-04-2008, 01:31 PM   #17
Registered User
 
Join Date: Jan 2006
Location: Glen Allen, ON
Posts: 312
I can't believe people. Go and believe someone who hasn't done it. Just because I have put a full Cayman B&B setup on one car and a combination of cayman Fabspeed and Supersprint on another, I guess it can't be done without a bunch of fab'ing. Please stop wasting my time.

Todd
__________________
Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
tholyoak is offline   Reply With Quote
Old 08-04-2008, 01:38 PM   #18
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Quote:
Originally Posted by tholyoak
I can't believe people. Go and believe someone who hasn't done it. Just because I have put a full Cayman B&B setup on one car and a combination of cayman Fabspeed and Supersprint on another, I guess it can't be done without a bunch of fab'ing. Please stop wasting my time.

Todd
Look Todd I thank you for your input. You did say you have put the cayman header on your car. I called B&B because IM VERY INTERESTED and not wanting to wast anybodies time. Yours eighter so I called them directly. PM me your number and I will call you too. Really not wanting to piss people off. I need input and help and that why I'm on here.
Sincerely,
Jeff
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-05-2008, 06:08 AM   #19
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
I found an interesting header for the Boxster 987 / Cayman at Design911. It looks pretty well designed and would flow well and it has cats. Not a lot of specs on it yet and the price is high. This header like a lot of them are more of a true exhaust manifold than a header with very short primary pipes, not really taking the need for the correct length and diameter into consideration for all out engine performance.

http://www.design911.co.uk/index.htm?Region=US


I really like the B&B header and a person could mount a set of cats somewhere else down stream. The folks at B&B were interested in quality and performance both. They did not try to up-sale me on anything, but tried to steer me in the direction that they thought the best for what I was trying to do. I really appreciate a company like that. Without hesitation they told me where they buy the parts that they use and I could do it myself and a more of a one-off cost effective way.
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Old 08-05-2008, 06:17 AM   #20
Registered User
 
Join Date: Sep 2007
Location: Austin, Texas
Posts: 26
Here is the link to Bill Boat Performance Exhaust (B&B) I couldn't copy there pic of the Cayman header and post it here or at least I didn't know how too.

http://www.bbexhaust.com/car/cayman/
__________________
Ride Big and Tall or Not at All
m2speed is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 11:47 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page