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Discussion summary
YOUR RESEARCHInstalled Speedtech Catless X-Pipe
Leading reported evidence
Install pre-cat sensors in the correct bungs
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
As far as O2 sensors, I simply installed the pre-cat sensors in the correct bungs and then for the post-cat sensors I added a 90 degree O2 spacer and another O2spacer that has orifices that you can change out and threaded the sensors into those.
Leading evidence: 'Install pre-cat sensors in the correct bungs' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install pre-cat sensors in the correct bungs' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
I'll try to snap some pics of it installed tonight.
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Suggestion
However, I'm feeling a bit guilty about running catless - are you guys able to weld your cats into a pre-existing Speedtech x-pipe?
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Suggestion
I've been running X51 headers (attached to my X51 motor), Fisters and the SpeedTech catless X-pipe the past 3 years on my track car.
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Install pre-cat sensors in the correct bungs
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
As far as O2 sensors, I simply installed the pre-cat sensors in the correct bungs and then for the post-cat sensors I added a 90 degree O2 spacer and another O2spacer that has orifices that you can change out and threaded the sensors into those.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
16 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T020439Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I received my Speedtech Catless X-Pipe Friday and installed it this weekend. I wish I had taken a picture before I installed it. The craftsmanship is beautiful. It was polished to a mirror sheen and looked even better than the pics on their website.
The install was very straight forward and it fit perfect! It came with all the required fasteners and gaskets. My only concern with the install is that that clamps that attached the exhaust to the hanger bracket were a bit loose on the x-pipe. I added a shim to account for that and everything tightened up fine. It definitely removed some weight and freed up some space back there!
As far as O2 sensors, I simply installed the pre-cat sensors in the correct bungs and then for the post-cat sensors I added a 90 degree O2 spacer and another O2spacer that has orifices that you can change out and threaded the sensors into those. I started with the smallest orifice. No CEL has popped up SO FAR... I'm keeping my fingers crossed.
I already had Fabspeed headers and mufflers. I was really hoping to do a full Fabspeed exhaust, but I just couldn't justify to myself that the Fabspeed x-pipe was twice as much. I do love my Fabspeed headers and mufflers though.
The Speedtech X-Pipe sounds great coupled with the Fabspeed components. It sounds like a race car when on the throttle hard but just throaty and pretty quiet when cruising. I am very happy with it. I didn't notice an appreciable drone on the Interstate.
I'll try to snap some pics of it installed tonight.
I forgot to mention that I only noticed a very minor decrease in low end torque based on the butt dyno. But these engines rev so quickly it is not an issue at all.
Good to know... I am looking at the NHP X pipe which is only $599... From my previous sports cars the X pipe has made the exhaust a little higher pitch than the factory set up. Have you noticed that at all? My Afterhours Exhaust is just Very Very deep and would like it to be a little higher pitched if possible
I would definitely say that this made it a bit higher pitched as it's reving. Some would say ricey, I say racey! It really sounds MUCH like a cup car to me with the Fabspeed headers and mufflers.
John D II is on here with an account and offers a Rennlist discount that gets it REALLY close to NHP. I've not laid hands on any NHP products, but Speedtech is first rate craftsmanship with quality materials. I almost hated to hide it under the bumper it looks so good.
Matt,
As a side note - A higher pitched tone is our goal on the Porsche flat 6, as it is the key to eliminating drone and sounds more like the highly desired GT3 exhaust tone. Low frequency tends to boom like bass on a stereo, which subsequently rattles the cabin and makes unwanted drone.
I've been running X51 headers (attached to my X51 motor), Fisters and the SpeedTech catless X-pipe the past 3 years on my track car. A W E S O M E sound.
I'd to go louder mufflers, maybe SpeedTech or, FS Supercups to complete the package.
John,
Another happy customer with your catless X-pipe. However, I'm feeling a bit guilty about running catless - are you guys able to weld your cats into a pre-existing Speedtech x-pipe?
So, almost a month later. Daily driver. No CEL yet.
I really think the car is making more power without the cats. But, no dyno.
Here are a few pics showing the O2 spacers on the after-cat sensors. It is an adjustable spacer with the smallest orifice installed, then a 90 degree spacer. I would have tried to use just one of them, but they were both required to have the necessary length in the sensor wiring. It sounds self-evident, but unhooking the connectors on the O2 sensor cables helps keep them from twisting when removing an installing the sensors. The connectors for the driver's side are just in front of the latch and the two for the passenger side are just behind the passenger side tail light. (Pics below. I lifted these connector pics from another forum. Mine were cleaner!)
Drivers side:
Passenger side:
Pre-cat and after-cat. After cat has two spacers.
Pre-cat
