Johnny,
The headers with 100 cell cats are very free flowing and when combined with the secondary delete and the muffler, there was not engough backpressure.

Low end torque was fine with the cat deletes and muffler, the headers where the problem. replaceing the OEM muffler fixed the issues, and it is easier to change than the headers.

Is the m22 ss a basic bolt on for the non s cars or will there need to be some modified install done?I got a shop that will do the install for $200 as long as it doesn't get complicated.

bolts right up. Taking off the OEM is the time consuming part. Some people do it without taking off the bumper. Tried that once, have the knuckle scars to prove it. Its possiable, but taking off the bumper will save time.

I agree with you in so far as 100 cell cats are a bit too free flowing for street applications . Moreover, the ecu has to be re-mapped in order to avoid CEL's, and keep the vehicle OBD II compliant . With that said, the combination of a freer flowing cat-back , along with deletion of the secondary cats, in my experience reduced back pressure to the extent that low end and mid range torque suffered . This deficiency was remedied by switching to 200 cell cats, along with some exhaust reconfiguring .

The short answer is no . Both the oem muffler and secondary cats are very restrictive . The Charlie Chan muffler should increase flow a bit, at the same time maintain effective back pressure, and provide better sound (subjective) .

Good call. Afterall no one can explain why the Maxspeed cats have side-entries instead of a straight design. I've never seen that on any other aftermarket performance cats period.

This leads me to ask, what exhaust system did you end up with and did it require a new chip program in order to make it all work?

AKL :confused:

I stuck with the principles of the oem header/pre-cat configuration by having M&M Exhaust in Germany custom fabricate a set of headers and cats using longer, 2 1/2" diameter equal length primaries that flow into a merger collector with HJS 200 cell tri-metal cats. The muffler is a custom cat-back with 2 1/2" diameter inlets and 3" outlets from 9ff, along with secondary cat deletes . It was a tremendous improvement over the oem system; albeit a very expen$ive one . And the sound is just ripping ! Almost to the extent of the Fabspeed race exhaust .

p.s. I did have the ecu re-programmed, however, it was not required .

Ok ordered off eBay $299 free shipping .

Do you guys know how to determine if the timing is being retarted, and the car de-tuned/ in limp mode?

Is this possible to tell with Durametric?

Thanks in advance!

I must be responsible for at least 3 or 4 members buying this Charlie Chan exhaust . I'm almost deserving of a commission !

..or condemnation and subsequent boiling in used 5-40 weight...??? All depends on how the sound works out and how SWMBO takes to the sound. She lives with me and I know where you live. And to hell with the microfilm, I have all the ammo and extra magazines... 25 June, day of reckoning when the CC muffler gets installed.

We will see AKL:cool: :dance: :matchup: :dance:

....or die trying.....!!!!! :dance: :dance: :dance: :dance: :dance: :dance:

AKL

I've had this on my car for 3+ years. I was Che's (Deluboz) test user when he was the first to import them.

Between 2-3k rpm, the cabin resonance can be deafening, especially with the top up in stop and go traffic.

Now with the top down it sounds glorious and with a helmet on and the top up and windows down at the track it really helps to hear when you should shift instead of looking down. That's why I haven't removed it. That and the fact I don't have cash to put on anything different right now.

Between 2-3k rpm, the cabin resonance can be deafening, especially with the top up in stop and go traffic.


Yikes ! Don't say that, AKL will end up with a Restraining Order against him !! :)

Different strokes for different folks, I guess. I just value my hearing and want to guard against nerve deafness. Seriously.

Last thing I want to do is screw up my hearing because my muffler had too much resonance between 2-3k rpm!

Fed ex just dropped off the m2 ss cat back and I'll have it installed Monday morning.

What about my commission ? :)

I hope it sounds as good as it looks.

post a sound clip

It's on and for the price couldn't be any happier :dance:

It's not deafening with the top up and has a nice growl ,comment was made about sound discomfort at 2k-3krpm I noticed it but also realized it when I was in 3 rd gear and should've been in 2nd as the rpms were below 2k and as the car came up to speed thats when I heard the sound.

I did cat back only and plan to do air intake shortly,mine is a 2.7 2003 with 49000 miles and plan on doing 60 k service @ around 53 k and while the lid is off do the intake.

I also saw a post "eBay muffler" with a sound clip and I must say that's the exhaust I bought and mine sounds much better with no distortion,might be device used to record.

Is there a break in period for these?as I drove my car throughout the day the growl got deeper :cheers:

Nhp
 

I believe mine is NHP. I did mine hole exhaust over last year. For a little over 2K. Straight headers, 200 cell cat mid-pipes and sport muffler. It does drone at highway speed in 5th gear. I moved the sensor to right before and after the mid-pipe cat. No codes. I replaced the intake with Agency Powers cold air intake. still no codes. With Dyno Scan on My laptop in the quarter mile dyno run showed 24 HP increase after intake and exhaust. I went to FABSPEED for a ECU tune the tech there showed me their exhaust. same sound.

So if the stock exhaust is restrictive, and going cat-less with the headers and mid pipes is too free flowing, could you mix the two and get a great Porsche sound with just enough back pressure? or is that just wishful thinking?

Right now I have the v1 deluboz muffler with a cat-less setup using the chineese headers and well... its rowdier than a bullrun. It sounds like a racecar but just a little too crazy for putting around town.

Resonance from a Dansk sport exhaust for 986
 

Hi all, I've just had fitted a DANSK Rear Sport silencer with twin outlet tailpipes (Part No.: 705331051) to my 2003 986 Boxster S but I do not like the resonance inside with the top up at about 2,000 - 3,000 revs. It's far too loud and is putting me off driving the car. Is there any way I can quieten it? Thanks Tone

You could try this, though the fabrication may not be cheap:
Exhaust drone resonator fix - design and construction -

subscribed. I am looking to beef up the sound on my stock 03 S.

A more comprehensive review of Fabspeed on a 01 Boxster S
 

I just did an install of BOTH Fabspeeds Supercups and Fabspeeds Maxflows. I analyzed them on the street, the track and the dynamometer. More info then you can dump into a single blog so I wrapped it up into a video.

After looking at all the pro and cons, I would recommend the MaxFlos'. Net gain of 24HP, 19ft-lbs and 17 fewer pounds, and the best overall sound quality.

Find how who I came to that conclusion here: https://youtu.be/MdCQg2tJFYg .


http://986forum.com/forums/uploads02...1569690896.jpg

Loved the video and explanation. Well done test method.

Have you considered the 987 airbox and IPD (or similar)?

I have considered IBD. As an recovering engineer, i always look at the physics first to see if it has potential. Some of the marketing content for IPD seems appears to be a little "snake oily", so i have been having reservations. Its about $1100 for both the plenum and 74mm throttle body, and I find it hard to believe that it will really deliver 30HP and 35ft-lbs. However I have not seen any data proving the results valid (or invalid). If I ever do purchase and and install I will post the results.

https://www.fabspeed.com/porsche-986-boxster-ipd-intake-plenum/

Rotofab Tune
 

@michael

Thank you for putting that video together, great testing methodology.

I recently purchased a 01 986 s that already had the fabspeed headers / maxflow exhaust and I think the sound is incredible. My last "fun" car was a chevy ss with an LS3. I thought I was never going to enjoy the sound another car as much as that ls3 and I was wrong, the music is just in the higher revs now.

I am going to research ipd intake, I agree it sound like a lot of power on the claim side.

Question on the fabspeed tune you have. One thing I noticed about mine is that I have less emissions monitors then I am used to seeing (was not a problem for my ny emissions test). All the monitors I have are green and there is no sign of any issues, but there are just less.
This first image is a scan of the boxster with a basic innova 3100
http://986forum.com/forums/uploads02...1573681662.jpg

This one is the boxster with a foxwell scan tool
http://986forum.com/forums/uploads02...1573681682.jpg

And this final one is to contrast, it is my 2019 pilot with innova
http://986forum.com/forums/uploads02...1573681708.jpg

I know the pilot is much newer and might have additional monitors from 2001, but I am pretty sure there were originally more than 5. Have you noticed anything like this since you got the tune?

-Brian

I realized my last post probably dissevered a separate thread after I put a bit more thought and detail into the question. Here is the link: http://986forum.com/forums/performance-technical-chat/76639-fabspeed-headers-exhaust-tune-case-missing-emissions-monitors.html

I'll add my 2 cents here. I had a Fabspeed Maxflo exhaust installed on my 2001 Boxster S. The upside is that it sounds great when hammering on from 4000 to the redline, and there seems to be more urge than before up there, but on the downside, the drone at 2000 rpm is driving me nuts and there's a noticeable dip in midrange torque. I'm wondering if it's possible to reinstall the standard muffler with the Fabspeed secondary cat delete pipes

Hi BG305. Unfortunately I was not monitoring my emission before or after the tune. If you have the Fabspeed tune, they may have deactivated parts of the emission monitoring to prevent the MIL light activating.

Hi Peter. I think you could install the stock mufflers on the Fab speed cat headers, but it would surprise me if it improve your torque / horsepower at lower RPM. Attached are my dyno runs, comparing the stock car to maxflow to supercup. I did not test the configuration you were talking about which is the new headers with the stock muffler. Nevertheless you can see from the charts that in all runs the Fab speed results were better than stock across the entire rev band.

http://986forum.com/forums/uploads02...1603543880.jpg

Not a flat 6, but I have these mufflers. They seem to do alright at 2k rpms. I still need to put the car on the ground and give it a good rev to know for sure.


As for quieting them down; an insertable motorcycle baffle might be the best way to give it a bit of "quiet". Thats what I'm gonna do if my V6 is too obnoxious during driving.

https://www.ebay.com/itm/2-X-4-Exhaust-Muffler-Silencer-Baffle-Insert-Motorcycle-Chopper-ATV-Db-Killer/153732248608?hash=item23cb27f420:g:~CgAAOSwJzpc0yP 3

^^^ couple of these might do it right.


http://986forum.com/forums/uploads02...1603680679.jpg

This is interesting.

While not an exact comparison, I have the Fabspeed MaxFlo on my 3.6 996 and there is zero drone.