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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > downpipes catless or catted whp difference?



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      09-10-2009, 06:45 PM   #1
john boxter
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downpipes catless or catted whp difference?

hey guys anyone know what the difference in power i would be getting by going catless over catted? and if i keep my stock exhaust will there be a smell of gas if i go catless downpipes? please let me know ofcourse dynos would be the best but probably nothing comparing that out there thanks guys!
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      09-10-2009, 10:07 PM   #2
john boxter
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no idea huh can i still expect 20 whp gains from catted downpipes?
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      09-10-2009, 10:23 PM   #3
Mike@N54Tuning.com
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I think people might be encouraging you to SEARCH as its been covered many times. I would say catted will give you 50% of the gain of catted pipes.

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      09-10-2009, 10:48 PM   #4
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We just did some back to back runs on a B5 S4 - setup uses same cats - and we lost 7whp and zero torque with the HFCs. Not the same car, but will give you an idea.
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      09-10-2009, 10:50 PM   #5
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AR Design catless DP's FTW!!
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      09-10-2009, 10:50 PM   #6
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AR Design catless DP's FTW!!
Who are you?



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      09-10-2009, 10:52 PM   #7
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so nasty...
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      09-10-2009, 10:52 PM   #8
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Is this an ar design DPs love-in

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      09-10-2009, 10:53 PM   #9
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I'm swappin out to Riss or VK's.... pffftttt!!
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      09-10-2009, 11:50 PM   #10
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joking of course before i make andrew cry...
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      09-10-2009, 11:51 PM   #11
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joking of course before i make andrew cry...
too late
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      09-10-2009, 11:53 PM   #12
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17 texts since i posted that jokingly....
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too late
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      09-10-2009, 11:54 PM   #13
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17 texts since i posted that jokingly....
BWHAHAAHAHA and i got 20 calls to swap out to RR/VK asap... u have alot of pull on this forum craig
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      09-11-2009, 01:28 AM   #14
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You guys crack me up

Not all of us are on the forums 24x7 Craig.... we have these cool things called lives
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      09-11-2009, 01:44 AM   #15
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ahhhh there you are, I guess he took you out for dinner... my bad!!
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You guys crack me up

Not all of us are on the forums 24x7 Craig.... we have these cool things called lives
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      09-11-2009, 01:47 AM   #16
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ahhhh there you are, I guess he took you out for dinner... my bad!!
LOL........
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      09-11-2009, 01:49 AM   #17
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Enough PW'in up this man's thread.... bottomline you need DP's give Andrew a holler great quality parts and customer service!!
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      09-11-2009, 11:34 AM   #18
john boxter
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i just dont know how much power i would be loosing if i ran catted and i dont know what people usually complain about with downpipes
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      09-11-2009, 11:52 AM   #19
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We just did some back to back runs on a B5 S4 - setup uses same cats - and we lost 7whp and zero torque with the HFCs. Not the same car, but will give you an idea.

Bueller?
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      09-11-2009, 12:01 PM   #20
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i dont understand what uses some cats means? like in the exhaust in the downpipes where and do you think those numbers should be the same with the 335?
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      09-11-2009, 12:03 PM   #21
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Same cats, not some cats. Meaning the power losses on the 335i should be fairly similar.
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      09-11-2009, 12:04 PM   #22
john boxter
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oh haha thanks sorry i misread that my last question is i have the jb3 if instal catted downpipes and intake can i still run higher maps or are those designed for catless downpipes?
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