Schnell Headers on 986 with Stock Exhaust - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Adam · 08-06-2007, 01:50 PM

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!!

jwilson95 · 08-06-2007, 02:28 PM

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?

rule1 · 08-06-2007, 03:44 PM

Panameras, Did you get the message I sent you?

Adam · 08-06-2007, 04:15 PM

Jeff, I think you have to stick with some sort of pre-cat or CEL is likely. The 02 sensor will think there is an emissions device malfuction and more than likely throw a code if you go with a catless header i believe. I like these fabspeeds with high flow cats and before and after bungs. Yes, they are expensive but they have the cats and 4 bungs.

rule1 · 08-06-2007, 05:27 PM

I have maxspeeds headers on my 2000 and I have had no CEL or any problems with these headers. I had big gains with headers, muffler and EVO intake. Look on his EBAY store, My dyno results on there.

jwilson95 · 08-06-2007, 07:35 PM

Rule 1

I didn't see any dyno charts on the ebay store. Maybe I just missed it? It did say their opinion was 10-15 HP gain, but who knows really...

Did you go with the Maxspeed exhaust also? I have a B&B and like it so far.

Do you have the chart you can post along with sound clips, etc? I'd love to hear the sound difference.

I'm wondering if you can extend the O2 sensors that were in the cats and have 4 O2 sensors after the secondary cats thereby tricking the O2 sensors not to throw a code?

I will update if I get anything from my local mechanic.

jwilson95 · 08-06-2007, 07:36 PM

Hey Edevlin-

What brand did you go with for your system and have you had any issues?

panameras · 08-07-2007, 10:01 AM

Quote:

Originally Posted by rule1

Panameras, Did you get the message I sent you?

yeah I got your message thanks for that.

btw which muffler are you using? does it drone a lot? thats the only concern I have holding me back from get one.

panameras · 08-07-2007, 10:05 AM

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!!

Adam, is that the Fabspeed muffler? how does it sound any drone?

Adam · 08-07-2007, 11:09 AM

Quote:

Originally Posted by panameras

Adam, is that the Fabspeed muffler? how does it sound any drone?

I don't have first hand experience, but 1 or 2 guys on here have used the newer fabspeed muffler and said there was drone in the 2-3k rpm range. It not GHL bad but it is more than stock. I am considering using the Fabspeed header/cat combo with the main cat delete bypass pipes with the stock muffler. The stock muffler flows well according to the experts and isn't too loud. I think this combo would give a nice bump in power and sound without being over bearing.

noone986s · 08-07-2007, 01:53 PM

This is what I have installed, but the 3.2 versions. I have a pic of the old ones that I need to download from my phone. They have no cat.

http://www.cargraphic.co.uk/index.php?/s,6,7,18,714,2436/&start=12

The second ones you posted look good, but be aware that most of the bolts snapped and I had to helicoil them.

Will post photo later of the old one.

I am trying to choose a silencer that is not too noisy

panameras · 08-07-2007, 02:37 PM

Quote:

Originally Posted by noone986s

This is what I have installed, but the 3.2 versions. I have a pic of the old ones that I need to download from my phone. They have no cat.

http://www.cargraphic.co.uk/index.php?/s,6,7,18,714,2436/&start=12

The second ones you posted look good, but be aware that most of the bolts snapped and I had to helicoil them.

Will post photo later of the old one.

I am trying to choose a silencer that is not too noisy

thats some expensive and quality hardware *drool* excellent choice!

as for the silencer have you considered modifying your current one? like this:http://www.ppbb.com/boards/ppbbphp/showflat.php?Cat=&Board=ARCHIVES&Number=1067764&page=8&view=collapsed&sb=5&o=7&fpart=1

noone986s · 08-07-2007, 02:42 PM

Yeah I have seen that before, a bit too loud I think, I need to be under 98db for most of the trackdays here.

edevlin · 08-07-2007, 03:13 PM

As I said in a previous post, I picked up about 6 hp with headers, and high-flow cats. I got another 4 hp or so with the addition of a TTP cold air intake. That gives only a 10 hp or so increase on my 2000 2.7L boxster with modding the intake and exhaust systems.

That increase is significantly less than many of the claims that are made for such mods, but I think those are pretty realistic numbers for improvements of the 2.7L engine. As i understand it, both the 2.5L and 3.2L engines respond better with more hp with some of these same mods.

When I chipped the car, I picked up a little over 12 additional hp on the dyno. That means that depending on the dyno run, I am doing these days, I am only getting 20-25 hp over stock than stock with a full-on intake, exhaust and chip mod of the car (about 205 hp at the wheels). Again, much less than some of the claims for these mods. That being said, the car runs great, it is quite responsive and I love the sound of the exhaust, but those additional horses were not cheap....

Ed

Cloudsurfer · 08-08-2007, 09:04 PM

I have the new FabSpeed exhaust, and unfortunately yes, it does drone in the 2-3k range. I am still on stock headers, but am looking for ideas there. The FabSpeed headers are gorgeous and I am sure will not cause any CEL related issues, but damn are they pricey.

Heres my latest idea for a perfect exhaust for these cars: High flow catted headers (a la FabSpeed) to guarantee improved flow and scavenging, yet also no CEL related issues. Secondary cat deletes. Now, heres where I would like to think I'm onto something: Stock 03 muffler, but with RPM activated dump valves (almost like turbo wastegates) BEFORE the muffler section, that begin to open at say, 3500 RPM, and are fully open by say, 4500 RPM. With this design you have a perfectly quiet car for normal driving and cruising, with no resonance issues, yet when you get on the power, as the RPMs rise and you get into the meat of the power curve, you get a very free flowing exhaust, that will sound glorious as well.

Anyone else think this could hold some promise? I have a very qualified shop here that could do the work on designing a system like this, and we could have a prototype I'd be happy to test.

Patrick

panameras · 08-16-2007, 12:29 PM

Now can any forum moderators change the title of this thread to Maxspeed headers on 986..... instead of schnell?

panameras · 08-07-2007, 02:55 PM

these maxspeed headers are not bad all. stainless steel, nice welds, neat merge collector. quite a bargain too at $575. what do you all think?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=320143166771&fromMakeTrack=true&ssPageName=VIP:watchlink:middle:us

panameras · 08-07-2007, 02:32 PM

Quote:

Originally Posted by Adam

I don't have first hand experience, but 1 or 2 guys on here have used the newer fabspeed muffler and said there was drone in the 2-3k rpm range. It not GHL bad but it is more than stock. I am considering using the Fabspeed header/cat combo with the main cat delete bypass pipes with the stock muffler. The stock muffler flows well according to the experts and isn't too loud. I think this combo would give a nice bump in power and sound without being over bearing.

good to know stock muffler is up to the job. your combo sounds good, actually would be the most ideal setup IMO. hardly any aftermarket mufflers are drone-free, except maybe milltek so I have heard.

panameras · 08-16-2007, 12:14 PM

Received the headers today :dance: quite excited as you can imagine! It was paid last friday and they arrived here nicely packed (including gaskets and studs) on Wednesday. Not bad for delivering half way across the globe! Abosultely happy with their service. Going to put them on the car tomorrow. Will record some sound files for before and after. For the mean time here are some pictures that I took this afternoon