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Old 01-26-2021, 01:23 PM   #1
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200 cel -> testpipes + FVD Sound version.

I have been thinking.. Yes, itīs true..

I read and have heard that those running test pipes actually get less drone than the ones running eg 200 cel sport cats. Can this be correct? Or is it just the increased overall volume that makes the drone less obvoius?

If so, would you think that I could use my old 200 cel cat-pipes, just drill (and use general violence) out the cat-substrate and use this as test pipes? Or will the actual "bulb" where the cat used to be create drone or some other bad effects?

I run: ebay headers (no cats) and FVD sound version at the back.

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Last edited by Robert986; 01-26-2021 at 01:40 PM.
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Old 01-26-2021, 03:37 PM   #2
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Circuitwerks, the company that sells a lot of the ebay test pipes, sells a "resonated" version of them which is what you're describing. I have no idea what they sound like but you may try to reach out to circuitwerks and ask, or find someone who has installed those.

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Old 01-27-2021, 06:06 AM   #3
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If your 200 cell sport cats are still good, wouldn't it make more sense to save the labor of drilling them out, sell them, buy some catless midpipes to install, and pocket the difference as future beer money?
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Old 01-27-2021, 08:06 AM   #4
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If your 200 cell sport cats are still good, wouldn't it make more sense to save the labor of drilling them out, sell them, buy some catless midpipes to install, and pocket the difference as future beer money?
I get your point.. I cannot pass MOT with those cats, I doubt they are genuine 200cel, they basically suck.. :-)
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Old 01-27-2021, 03:23 PM   #5
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I have Manzo catless headers and Manzo catless test pipes with a circuitwerks v2 muffler. I get little to no drone. I don't have any experience with the stock exhaust as I almost immediately removed it.
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Old 01-28-2021, 06:36 AM   #6
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I get your point.. I cannot pass MOT with those cats, I doubt they are genuine 200cel, they basically suck.. :-)
They are cheap and on eBay

That said mine pass a UK MOT and have done for several years. 1 year it was very tight for some unknown reason but the next year with no changes there were no issues.
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Old 01-30-2021, 06:43 AM   #7
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They are cheap and on eBay

That said mine pass a UK MOT and have done for several years. 1 year it was very tight for some unknown reason but the next year with no changes there were no issues.
Thatīs the thing with cheap, if they work itīs great, if not, no big deal.

Plan now is to just cut the cats out and weld in a bit of pipe to run them as "testpipes".
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Old 01-30-2021, 11:48 AM   #8
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We call then decat pipes and you can buy them on ebay too. There are one which are straight through pipe and others which look like they have a cat but it has no core.
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Old 02-16-2021, 10:13 AM   #9
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Thanks for replys guys, soon I will know the answer.. Cut the cats away and made me a qouple of straight pipes. So I will go: Catless headers -> pipes -> FVD Sound version.

After a looong wait Iīll finally have my day at the dyno in the middle of mars this year. Doing the classic 987-airbox/MAF, IPD + 74mm TB + full day mapping on the dyno. Wish me luck! Was aiming for the 996 intake but didnīt manage.

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Old 02-16-2021, 01:12 PM   #10
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Originally Posted by Robert986 View Post
Thanks for replys guys, soon I will know the answer.. Cut the cats away and made me a qouple of straight pipes. So I will go: Catless headers -> pipes -> FVD Sound version.

After a looong wait Iīll finally have my day at the dyno in the middle of mars this year. Doing the classic 987-airbox/MAF, IPD + 74mm TB + full day mapping on the dyno. Wish me luck! Was aiming for the 996 intake but didnīt manage.

I have a pair of Fabspeed 987 sport-cats that i was going to remove the cat "bricks" and use on my 986 that I will sell.

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