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      06-16-2019, 03:54 PM   #1
Andrew
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Test Pipe vs X-Pipe Dyno Comparisons?

I tried searching but couldn't really find anything concrete. Specifically, I'm looking to compare the dyno results for two different setups:
  • Race X-Pipe
  • OEM X-Pipe w/ Test Pipes (remove primary cats; retain secondary cats)

I'd imagine the OEM X-Pipe w/ Test Pipes would result in less power, but how much? I'm trying to see if it's worth the additional power loss.

Can anyone post their dyno charts?
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      06-16-2019, 04:24 PM   #2
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4 to 9 less HP with test pipe. With Race X-Pipe car will stink but it doesn't bother some
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      06-16-2019, 04:59 PM   #3
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How about test pipe and stock x pipe 2nd cat delete? I'm interested in cutting the 2nd cats out and adding resonators to the stock X-pipe.
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      06-17-2019, 03:46 PM   #4
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Would be cheaper and less labor intensive to just go catless x-pipe. I made the switch and couldn't be happier with Macht schnells.
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      06-17-2019, 04:03 PM   #5
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Quote:
Originally Posted by DasboostF80 View Post
Would be cheaper and less labor intensive to just go catless x-pipe. I made the switch and couldn't be happier with Macht schnells.
I don't think it would be cheaper.. Test pipes are ~250 on the used market and install is not bad to DIY or have a shop do it in like an hour. X-pipes cost significantly more, even if they are used.
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      06-17-2019, 04:21 PM   #6
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X-pipe is about 5hp more than test pipes from what I have seen.
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      06-20-2019, 11:48 AM   #7
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+5hp + 100% bad smell..
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      05-14-2020, 02:29 PM   #8
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^pretty accurate haha
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      05-14-2020, 02:43 PM   #9
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It would be great to compile results of various types of xpipes.

My headers with catless xpipe made +15whp / +8wtq over test pipes.
http://www.tdott.me/2019/06/project-...mw-e92-m3.html

Did anyone notice how Valvetronic's catless x-pipe makes less power over a fully stock xpipe, than test pipes alone make?

Spencer's video only shows +12whp & +9wtq over stock, and it's fully catless.


Test pipes usually make over 20whp over stock. I don't have any dynos right now but there were many in the past, just have to search for them.
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      05-14-2020, 04:54 PM   #10
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Here's some reading on both:

Moto IQ - Project E90 M3: Part 2 – Macht Schnell Bypass Track Pipes and EAS 80mm Exhaust Tips

https://motoiq.com/Project-E90-M3-Pa...-Exhaust-Tips/

Super Street - Budget E9X BMW M3 Upgrades: 50hp for Cheap
http://www.superstreetonline.com/how...rades-part-ii/
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      05-14-2020, 07:05 PM   #11
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Quote:
Originally Posted by tdott View Post
It would be great to compile results of various types of xpipes.

My headers with catless xpipe made +15whp / +8wtq over test pipes.
http://www.tdott.me/2019/06/project-...mw-e92-m3.html

Did anyone notice how Valvetronic's catless x-pipe makes less power over a fully stock xpipe, than test pipes alone make?

Spencer's video only shows +12whp & +9wtq over stock, and it's fully catless.


Test pipes usually make over 20whp over stock. I don't have any dynos right now but there were many in the past, just have to search for them.
He did say that he didn't change to a catless tune, which probably explains the smaller horsepower delta.
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      05-14-2020, 07:31 PM   #12
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Quote:
Originally Posted by 91foxbody View Post
He did say that he didn't change to a catless tune, which probably explains the smaller horsepower delta.
Test pipes produce better results even without a tune.
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