Fabspeed Bypass Pipe-Any Experiences Welcomed.

[986NY]

Hi Guys,
I have a 2002 Boxster S and I thinking of installing a Fabspeed secondary cat bypass pipe. These pipes eliminate the secondary cats. I would like to just use the Fabspeed Bypass Pipes and still use the stock 986 2002 Boxster S stock muffler.
I wondered about the new exhaust sound, if any, and how it may compare to the stock sound with the secondary cats.
Also, do you think there would be any noticeable increase in HP.
All comments will be very much appreciated.

[Johnny Danger]

Originally Posted by 986NY

Hi Guys,
I have a 2002 Boxster S and I thinking of installing a Fabspeed secondary cat bypass pipe. These pipes eliminate the secondary cats. I would like to just use the Fabspeed Bypass Pipes and still use the stock 986 2002 Boxster S stock muffler.
I wondered about the new exhaust sound, if any, and how it may compare to the stock sound with the secondary cats.
Also, do you think there would be any noticeable increase in HP.
All comments will be very much appreciated.

This topic has been commented upon ad infinitum. In any case, there's no real horsepower to be gained by simply eliminating the secondary cats . However, it will reduce a fair amount of unnecessary back pressure, and give your vehicle a slightly more aggressive sound. Perhaps, most importantly, it will shed a significant amount of weight . And that in and of itself can have it's performance advantages .

[Lobo1186]

Originally Posted by Johnny Danger

This topic has been commented upon ad infinitum. In any case, there's no real horsepower to be gained by simply eliminating the secondary cats . However, it will reduce a fair amount of unnecessary back pressure, and give your vehicle a slightly more aggressive sound. Perhaps, most importantly, it will shed a significant amount of weight . And that in and of itself can have it's performance advantages .

seeing as johnny you are the exhaust guy as it were, how do u feel about a full cat-less setup with a stock muffler? (sorry I dont mean to hijack.)

[dennis]

I just did this mod a few weeks ago, only the pipes, everything else stock. Sound is deeper, not huge difference, but better. Thebcar feels like it breathes better, revs quicker, so may seem like more hp, bu not sure. One of my cats were startingnto deteriorate, so the my hve been partially clogged, but either way, now, the car seems to run better and rev quicker.

[Johnny Danger]

Originally Posted by Lobo1186

seeing as johnny you are the exhaust guy as it were, how do u feel about a full cat-less setup with a stock muffler? (sorry I dont mean to hijack.)

Based on my experience, you'll lose a significant amount of low end and mid range torque.
Not to mention CEL's galore . In addition, the oem muffler is extremely restrictive . Personally, unless your budget will allow you to purchase a set of high quality headers and cats, I would stick with the oem headers/pre-cats , delete the secondaries, and replace the oem muffler with a suitable aftermarket one . There are numerous brands across a wide price spectrum that will not only weigh considerably less, but will provide better exhaust flow and sound superior .

[jwade]

See my sig.

I am running completely catless and have not had issues, but retaining the stock muffler would not be good. I chose to purchase an oem Eisenman built PSE and the sound is really nice. That version will fit up to MY '02.

As far as aftermarket headers, I chose Turbowerx and they deliver results. You need to find a good indy mechanic and he will know how to keep your O2 sensors from triggering a CEL. It can be done.

I have had only one CEL after having my setup for a year. I purchased the Durametric cable, downloaded 6.0 software and it was gone in seconds..

To get good results, you need to take the plunge and do all exhaust replacement from the headers to the muffler. Just don't buy junk or you will not have a good experience...

All in all, I have 800 in headers, 500 for the Fabspeed pipes, and I think around 13-1400 in the PSE. Bought it new off Ebay a long time ago. They sometimes surface...If not, they can be had close to 3k now, but other manufacturer's like Fabspeed make a good muffler.

I have not run my car on a dyno, but can tell you that additional power is being made. Sound is very nice too.

[Johnny Danger]

Originally Posted by jwade

See my sig.

I am running completely catless and have not had issues, but retaining the stock muffler would not be good. I chose to purchase an oem Eisenman built PSE and the sound is really nice. That version will fit up to MY '02.

As far as aftermarket headers, I chose Turbowerx and they deliver results. You need to find a good indy mechanic and he will know how to keep your O2 sensors from triggering a CEL. It can be done.

I have had only one CEL after having my setup for a year. I purchased the Durametric cable, downloaded 6.0 software and it was gone in seconds..

To get good results, you need to take the plunge and do all exhaust replacement from the headers to the muffler. Just don't buy junk or you will not have a good experience...

All in all, I have 800 in headers, 500 for the Fabspeed pipes, and I think around 13-1400 in the PSE. Bought it new off Ebay a long time ago. They sometimes surface...If not, they can be had close to 3k now, but other manufacturer's like Fabspeed make a good muffler.

I have not run my car on a dyno, but can tell you that additional power is being made. Sound is very nice too.

With all due respect, the additional power that you are experiencing must be in the upper rpm range . Clearly, your system is more characteristic of how track applications are set-up, wherein the concentration is much more focussed on high end power. Virtually every boxster that I know (most importantly my own), lost low end to mid range torque when run completely catless . Furthermore, with that set-up the only way that I'm aware that one can truly rule out CEL's is to re-map the ECU. And, that comes with it's own separate cost .

[Marburk]

Originally Posted by Johnny Danger

Based on my experience, you'll lose a significant amount of low end and mid range torque.
Not to mention CEL's galore . In addition, the oem muffler is extremely restrictive . Personally, unless your budget will allow you to purchase a set of high quality headers and cats, I would stick with the oem headers/pre-cats , delete the secondaries, and replace the oem muffler with a suitable aftermarket one . There are numerous brands across a wide price spectrum that will not only weigh considerably less, but will provide better exhaust flow and sound superior .

I'm new to the forum and this my first post. I am considering doing the exact exhaust mod you just described on my 2003 986. I'm looking at the Fabspeed Maxflow exhaust system with the 2ndary cat delete pipes and a performance muffler. I'm also researching the FVD Brombacher "Sound Version" muffler with the secondary cat delete pipes. However, after reading some of the posts on other threads about in-cabin drone and resonance, I'd like to be able to meet another member who has already done either mod and hear their car in person. I live in Laguna Niguel, CA (Orange County). If anyone with the mods lives in Southern Cal I'd love to meet them and check out their mods. Please send me a PM. Thanks.

[ProjectM96]

There are youtube videos of the Fabspeed Exhaust sounds from inside the car and outside. You can access them from Fabspeed.com when looking at the products, or you can go to youtube.com and manually search them.

[DFW02S]

Originally Posted by 986NY

Hi Guys,
I have a 2002 Boxster S and I thinking of installing a Fabspeed secondary cat bypass pipe. These pipes eliminate the secondary cats. ...

I've got the Top Speed Pro-1 test pipes and they improve the sound at idle, making it a bit deeper. The car also sounds better as you rev it, but I don't have any recordings.

As to power increase, it's been so hot that I can't fairly judge but maybe some due to the improved flow and saving 7 pounds per side.
When the weather gets cooler in October I should notice a difference.

A worthwhile mod based on my experience.

[insite]

I'll post before & after vids this weekend.

[Marburk]

I found a very helpful link to an explanation that helps understand the difference between the OEM 986 exhaust and a modified performance exhaust system (in this care, the Fabspeed Maxflo system):

http://www.fabspeed.com/videos/Boxster%20986%20Maxflo%20Muffler%20Explanation%20V ideo.wmv

This may be pretty basic for those of you who have a lot of experience with these mods, but it really helped me understand the differences between the OEM system and a performance system. Thought I'd share the link for anyone who is researching an exhaust mod for the first time.

[Type911]

Reviving an old thread...considering doing the same.

How is the sound and if you had to do it over again would you? I have had good success with Fabspeed Cat-bypass and primary muffler by-pass pips on 964's but no experience with 986.

[Dave80GTSi]

For your enjoyment.

Open canister with a Dremel wheel, remove cat, reweld canister.

Cost = $0.00

[Most_Wanted]

Insane restriction. Having a hard time breathing just looking at the pics. Makes me want to purchase some test pipes asap.

[kk2002s]

I'm all for saving money but to go through removing, cutting and then welding back up
I bought Circuit Werks cat delete pipes around $150. It fit no issues and it is a nice clean install with all the pieces. I do like the idle sound and @ 2900 RPMs just cruising with the top down there is a nice note to the exhaust. It sounds pretty mean in tunnels too.

[Cunningr]

Originally Posted by kk2002s

I'm all for saving money but to go through removing, cutting and then welding back up
I bought Circuit Werks cat delete pipes around $150. It fit no issues and it is a nice clean install with all the pieces. I do like the idle sound and @ 2900 RPMs just cruising with the top down there is a nice note to the exhaust. It sounds pretty mean in tunnels too.

Do you get any error codes by just swapping in those bypass tubes?

[royalnewjersey]

So sorry to revive an old thread. Had a few questions of my own that I haven't been able to answer after a few days of searching.

I'm looking at going catless. I just had a shop open my stock "S" muffler, remove 70% of the baffling, and re-weld. This gave the car a much nicer exhaust note, but it's still too quiet. So now I'm looking at removing some of the restriction by replacing the secondary cats. However I'm stuck deciding between straight pipe or resonated. Anyone have any experience with the resonated cat delete pipes? Circuit works makes them, and thought it might be insurance against an overly noisy and drone-y street exhaust. Thoughts?

[maytag]

Originally Posted by royalnewjersey

So sorry to revive an old thread. Had a few questions of my own that I haven't been able to answer after a few days of searching.

I'm looking at going catless. I just had a shop open my stock "S" muffler, remove 70% of the baffling, and re-weld. This gave the car a much nicer exhaust note, but it's still too quiet. So now I'm looking at removing some of the restriction by replacing the secondary cats. However I'm stuck deciding between straight pipe or resonated. Anyone have any experience with the resonated cat delete pipes? Circuit works makes them, and thought it might be insurance against an overly noisy and drone-y street exhaust. Thoughts?

Whoa whoa whoa! You're not suggesting changing something that the Porsche engineers designed, are you?
Hahaha.....
Just foolin' with ya....

Sent from my SM-G930T using Tapatalk

[NewArt]

You might check out my video on my YouTube channel about the secondary cat bypass. Sounds good, no drone, a bit louder but not a lot. See the DIY section here for the link.