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Old 04-27-2020, 04:12 AM   #1
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circuit werks or Blackhorse cat backs?

in a squeeze for time to buy, so quick...like to hear some opinions on this:
I am preparing for a clutch job and after getting my exhaust off, I'm leaning towards slapping on a catback system from ebay.

1. should I go with the blackhorse-racing or the circuit werks?
Circuit werks is about 50 bucks more, but from the pictures, the blackhorse just
looks nicer.
Also, I see systems that are combo straight headers and cat back (using the secondary cat) by reusing the center pipe.

2. Does this introduce tuning and CEL problems but eliminating the front cat?

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Old 04-27-2020, 05:52 AM   #2
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You will most likely get a cel if you switch to headers. The secondary cats will require a long O2 sensor lead to reach the downstream bung. My Circuitwerks high flow cats threw a cel for insufficiency. You would then need a tune to eliminate that. You might watch some of my videos which deal with these things.
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Old 04-27-2020, 08:45 AM   #3
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For what it is worth, I have the circuit werks 2nd cat delete on my 02 S, no code issues and have seen a few muffler cat back kits and they seem to be quality. My 2nd cat deletes and U pipes to muffler fit great and welds were very nice. Also, they are out of TX/ USA!

I would recommend them and there are some bosch o2 sensor extensions that you can make if needed as well.
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Old 04-27-2020, 11:38 AM   #4
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Originally Posted by aparke4 View Post
For what it is worth, I have the circuit werks 2nd cat delete on my 02 S, no code issues and have seen a few muffler cat back kits and they seem to be quality. My 2nd cat deletes and U pipes to muffler fit great and welds were very nice. Also, they are out of TX/ USA!

I would recommend them and there are some bosch o2 sensor extensions that you can make if needed as well.
Yes, a secondary cat delete won’t throw a code if you’re running stock headers which have the primary cats integrated in North America.
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Old 04-27-2020, 12:03 PM   #5
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You will most likely get a cel if you switch to headers. The secondary cats will require a long O2 sensor lead to reach the downstream bung. My Circuitwerks high flow cats threw a cel for insufficiency. You would then need a tune to eliminate that. You might watch some of my videos which deal with these things.
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James,

You answered it here apologies. So do you think some other make would not throw a code ie if they flowed less?
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Old 04-27-2020, 04:54 PM   #6
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Honestly, I’m not sure if the Circuitwerks wouldn’t have been okay had I not done all the other stuff before having the tune. What I mean is, I may have burnt out the cats by running a too lean or too rich condition due to my other mods before I got the proper tune. I wish I could be more helpful but I tend to have great 20-20 hindsight!
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Old 04-28-2020, 04:07 AM   #7
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I used Circuit werks and they fit without issue. I loved the extra Note they gave plus a pit of weight removed. Hardest part was removing the 3 bolts/nuts at the collector. I thought they were priced right
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Old 05-01-2020, 05:43 PM   #8
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think I am going with the fabspeed setup, second cat delete and streamlined mufflers. 1400 bucks, but Im already at 800 with the cheap stuff off ebay if I do the same thing, so...thoughts?
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Old 05-02-2020, 09:57 AM   #9
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Honestly, I’m not sure if the Circuitwerks wouldn’t have been okay had I not done all the other stuff before having the tune. What I mean is, I may have burnt out the cats by running a too lean or too rich condition due to my other mods before I got the proper tune. I wish I could be more helpful but I tend to have great 20-20 hindsight!
Thanks, for the comments. Everybody's experience is valuable especially people like yourself who have gone and done these things
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Old 05-02-2020, 10:07 AM   #10
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Originally Posted by NewArt View Post
Honestly, I’m not sure if the Circuitwerks wouldn’t have been okay had I not done all the other stuff before having the tune. What I mean is, I may have burnt out the cats by running a too lean or too rich condition due to my other mods before I got the proper tune. I wish I could be more helpful but I tend to have great 20-20 hindsight!
Thanks, for the comments. Everybody's experience is valuable especially people like yourself who have gone and done these things
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Old 05-05-2020, 04:42 PM   #11
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OK, I pulled the trigger, took the plunge and purchased the fabspeed Supercup Exhaust System...pricey but should be loud and pretty. 40lb weight savings too.
Anyone know how quick they ship? cuz I havent gotten any shipping notifications or anything
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Old 05-09-2020, 03:24 PM   #12
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think I am going with the fabspeed setup, second cat delete and streamlined mufflers. 1400 bucks, but Im already at 800 with the cheap stuff off ebay if I do the same thing, so...thoughts?
I went with the Fabspeed maxflow for my 2001 Boxster S. Love the sound above 3500 rpm, not digging the drone around 2000 rpm that makes highway driving a bit of a drag. The engine has more high end zing and ripping to the redline is addictive. Does it feel any faster? Marginally but it might just be because of the sound. You're not going to notice an extra claimed 7 hp and 10 lb-ft in the top end.
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Old 05-10-2020, 04:50 AM   #13
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I've run the cheap manifolds with 100 cell cats for about 3 years then with 200 cell cats for 3 years with no remap. Goes well but is always a bit close for emissions.
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Old 05-10-2020, 08:28 AM   #14
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Quote:
Originally Posted by PeterBleakney View Post
I went with the Fabspeed maxflow for my 2001 Boxster S. Love the sound above 3500 rpm, not digging the drone around 2000 rpm that makes highway driving a bit of a drag. The engine has more high end zing and ripping to the redline is addictive. Does it feel any faster? Marginally but it might just be because of the sound. You're not going to notice an extra claimed 7 hp and 10 lb-ft in the top end.
Right, don't expect performance upgrade, but reduced weight and complexity. Louder is cool and I generally don't do highway in the car anyway, but I could live with the drone also. I spent my childhood flying everywhere in little planes and that is a constant drone on trips...I liked it.

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