Noticeable downpipe gains?

Likeanowl · 12-18-2019, 08:41 PM

I guess this thread is just me being excited but I’m getting my vrsf downpipes on Friday and was wondering what to expect. Only other mods so far are jb4 and intakes. Will I notice any difference or just a slightly different exhaust note? If so, what should I expect? Sorry I’m just excited! Merry Christmas to me!

yjypm · 12-18-2019, 09:04 PM

Quote:

Originally Posted by Likeanowl

I guess this thread is just me being excited but I'm getting my vrsf downpipes on Friday and was wondering what to expect. Only other mods so far are jb4 and intakes. Will I notice any difference or just a slightly different exhaust note? If so, what should I expect? Sorry I'm just excited! Merry Christmas to me!

+50% exhaust volume
+some exhaust raspiness
+~20whp
+Noticeable gas smell

drgmt · 12-18-2019, 09:38 PM

Terrible sound
Exhaust smell
Very loud
Small power gain.

Bottom line - save your money.

m4dbimmer · 12-18-2019, 10:07 PM

Quote:

Originally Posted by yjypm

+50% exhaust volume
+some exhaust raspiness
+~20whp
+Noticeable gas smell

20whp? Did you prove this yourself? The mid pipe dyno sheets I've seen usually include the downpipe (ie. Full exhaust compare to stock), which is where most of the power is picked up.

TheirThere · 12-18-2019, 10:33 PM

louder
faster
zero smell
you might get a CEL
you won't pass emissions testing

yjypm · 12-18-2019, 10:39 PM

Quote:

Originally Posted by m4dbimmer

Quote:

Originally Posted by yjypm

+50% exhaust volume
+some exhaust raspiness
+~20whp
+Noticeable gas smell

20whp? Did you prove this yourself? The mid pipe dyno sheets I've seen usually include the downpipe (ie. Full exhaust compare to stock), which is where most of the power is picked up.

I should say at most 20whp. By running dps you will be able to run different tunes, which gives some extra hp. The hardware itself probably doesn't make much hp

ByeFelicia · 12-19-2019, 12:31 AM

Quote:

Originally Posted by TheirThere

louder
faster
zero smell > Hmmm no. There's smell.
you might get a CEL > Not might, will.
you won't pass emissions testing

corrections

m4dbimmer · 12-19-2019, 01:07 PM

Quote:

Originally Posted by yjypm

I should say at most 20whp. By running dps you will be able to run different tunes, which gives some extra hp. The hardware itself probably doesn't make much hp

About the midpipe though.. can you show proven gains?

tom @ eas · 12-19-2019, 01:14 PM

Catless DPs are worth about ~10whp on stock turbo setups.

Still no power from midpipes.

spool twice · 12-19-2019, 07:26 PM

Equal-length the exhaust, it will sound beautiful.

ICantDrive4Sht · 12-19-2019, 11:37 PM

Why are people so afraid of the smell? With my experience you only smell it if you`re standing behind the car, so whats the big deal

sicck_m4 · 12-20-2019, 12:35 AM

Downpipes made my M4 feel like a beast with JB4 map2 with 30% ethanol. Honestly smell was very minimal with the secondary cats on the midpipe. Now that I'm running VRSF single midpipe with downpipes, odor is very prominent but powerband has dramatically improved with very noticeable gains.

ntg44 · 12-20-2019, 06:13 AM

Quote:

Originally Posted by ICantDrive4Sht

Why are people so afraid of the smell? With my experience you only smell it if you`re standing behind the car, so whats the big deal

I'm sure you've driven behind a decatted car. It's f***ing annoying. Don't know if I hate that more or less than people swapping their head light bulbs for the blinding aftermarket ones that aren't meant for stock housings.

Plenty of people are more sensitive to the smell, including me. Even if the toxic vapors don't bother you personally, all it does is piss people off around you. Some people also have children, who don't want them exposed to the gases whatsoever - plenty out there from older semis and older vehicles.

No excuse to not have race cats. Nobody will feel the 15-20 hp difference at 500+ wheel, I promise.

behindthen0thing · 12-20-2019, 01:01 PM

If you smell exhaust. You're being poisoned

m4dbimmer · 12-20-2019, 01:31 PM

Quote:

Originally Posted by behindthen0thing

If you smell exhaust. You're being poisoned

But racracer? J/k.. just not worth it

mike@x-ph.com · 12-20-2019, 01:31 PM

Quote:

Originally Posted by Likeanowl

I guess this thread is just me being excited but I’m getting my vrsf downpipes on Friday and was wondering what to expect. Only other mods so far are jb4 and intakes. Will I notice any difference or just a slightly different exhaust note? If so, what should I expect? Sorry I’m just excited! Merry Christmas to me!

Exhaust sound is certainly noticeable , Merry Christmas

ByeFelicia · 12-20-2019, 03:26 PM

Quote:

Originally Posted by behindthen0thing

If you smell exhaust. You're being poisoned

Yes, and your lifespan will be diminished by 5 years exactly once you start smelling.

So choose wisely.

behindthen0thing · 12-20-2019, 03:38 PM

the last 5 are no good anyway

blockdoc · 12-20-2019, 03:56 PM

Quote:

Originally Posted by ByeFelicia

Quote:

Originally Posted by TheirThere

louder
faster
zero smell > [COLOR="blue"]Hmmm no. There's smell.[/COLOR]
you might get a CEL > [COLOR="Blue"]Not might, will.[/COLOR]
you won't pass emissions testing

corrections

I don't notice ANY smell to be honest

Likeanowl · 12-20-2019, 04:26 PM

I’m quite annoyed. The place that agreed to do it, full well knowing it was catless (I specifically asked if they’d do a catless downpipe), changed their mind after I had dropped off my car. Now they won’t do it. Anybody have any shops in northern Ohio they recommend that can do this? Or any good step by step how to videos? Much appreciated.

TheBreeze · 12-20-2019, 05:38 PM

Quote:

Originally Posted by ntg44

I'm sure you've driven behind a decatted car. It's f***ing annoying. Don't know if I hate that more or less than people swapping their head light bulbs for the blinding aftermarket ones that aren't meant for stock housings.

Plenty of people are more sensitive to the smell, including me. Even if the toxic vapors don't bother you personally, all it does is piss people off around you. Some people also have children, who don't want them exposed to the gases whatsoever - plenty out there from older semis and older vehicles.

No excuse to not have race cats. Nobody will feel the 15-20 hp difference at 500+ wheel, I promise.

Agreed 100%. Being 100% catless smells horrendous, it's actually embarrassing sitting in traffic, gassing yourself and all others around you. It also ends up covering your rear bumper with soot. If you keep the secondary cats, the smell is somewhat more tolerable provided you're in a ventilated area.

Some people like the sound, I think it sounds like ass.

Laostuh · 12-21-2019, 01:51 PM

Hi, so I just bought an M3 with no intention of MODDING the car since I'm not very mod saavy. But the M3 I bought has eisenmann exhaust and catless dps. My question is if I swap back on the stock downpipes will I pass smog in CA ? Also will the CEL go away once I put the stock down pipes back on?

12-18-2019, 08:41 PM	#1
Likeanowl Captain 1157 Rep 711 Posts Drives: BMW F80 M3/ Yas Marina Blue Join Date: Aug 2019 Location: Ohio iTrader: (0)	Noticeable downpipe gains? I guess this thread is just me being excited but I’m getting my vrsf downpipes on Friday and was wondering what to expect. Only other mods so far are jb4 and intakes. Will I notice any difference or just a slightly different exhaust note? If so, what should I expect? Sorry I’m just excited! Merry Christmas to me!
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12-18-2019, 09:38 PM	#3
drgmt Lieutenant Colonel 985 Rep 1,885 Posts Drives: M4 Join Date: Apr 2017 Location: Australia iTrader: (1)	Terrible sound Exhaust smell Very loud Small power gain. Bottom line - save your money.
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12-18-2019, 10:33 PM	#5
TheirThere 867-5309 76 Rep 308 Posts Drives: F80 M3 ZCP and E36 328i Join Date: Apr 2012 Location: 30.2672° N, 97.7431° W iTrader: (1) Garage List 2017 BMW M3 [0.00]	louder faster zero smell you might get a CEL you won't pass emissions testing
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12-19-2019, 01:14 PM	#9
tom @ eas BimmerPost Supporting Vendor 8115 Rep 18,808 Posts Drives: BMW Join Date: Nov 2005 Location: Anaheim, CA iTrader: (19) Garage List 2018 BMW i3s [0.00] 2010 BMW M3 [6.50] 2015 BMW M4 [5.25]	Catless DPs are worth about ~10whp on stock turbo setups. Still no power from midpipes. __________________ Tom G. \| european auto source (eas) email: tom@europeanautosource.com · web: https://europeanautosource.com· tel 866.669.0705 · ca: 714.369.8524 x22 GET DAILY UPDATES ON OUR BLOG · FACEBOOK · YOUTUBE · FLICKR · INSTAGRAM
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12-19-2019, 07:26 PM	#10
spool twice Rainbow Racer 1008 Rep 2,539 Posts Drives: BMW M4cs Join Date: Sep 2010 Location: Tampa Bay, FL Area iTrader: (7) Garage List 2019 M4cs [0.00]	Equal-length the exhaust, it will sound beautiful.
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12-19-2019, 11:37 PM	#11
ICantDrive4Sht Second Lieutenant 199 Rep 244 Posts Drives: F87 M2 Competition Join Date: Jul 2017 Location: Finland iTrader: (0)	Why are people so afraid of the smell? With my experience you only smell it if you`re standing behind the car, so whats the big deal
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12-20-2019, 12:35 AM	#12
sicck_m4 First Lieutenant 168 Rep 319 Posts Drives: F82 Yas Marina M4 Join Date: Aug 2019 Location: Las Vegas iTrader: (2)	Downpipes made my M4 feel like a beast with JB4 map2 with 30% ethanol. Honestly smell was very minimal with the secondary cats on the midpipe. Now that I'm running VRSF single midpipe with downpipes, odor is very prominent but powerband has dramatically improved with very noticeable gains. __________________ M4 Yas Marina Blue F32 Estoril Blue
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12-20-2019, 01:01 PM	#14
behindthen0thing Captain 840 Rep 937 Posts Drives: M4 Join Date: Jul 2018 Location: Germany iTrader: (0)	If you smell exhaust. You're being poisoned
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12-20-2019, 03:38 PM	#18
behindthen0thing Captain 840 Rep 937 Posts Drives: M4 Join Date: Jul 2018 Location: Germany iTrader: (0)	the last 5 are no good anyway
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12-20-2019, 04:26 PM	#20
Likeanowl Captain 1157 Rep 711 Posts Drives: BMW F80 M3/ Yas Marina Blue Join Date: Aug 2019 Location: Ohio iTrader: (0)	I’m quite annoyed. The place that agreed to do it, full well knowing it was catless (I specifically asked if they’d do a catless downpipe), changed their mind after I had dropped off my car. Now they won’t do it. Anybody have any shops in northern Ohio they recommend that can do this? Or any good step by step how to videos? Much appreciated.
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12-21-2019, 01:51 PM	#22
Laostuh Private First Class 51 Rep 173 Posts Drives: 2018 BMW M3 ZCP Azurite Black Join Date: Mar 2019 Location: Los Angeles iTrader: (0)	Hi, so I just bought an M3 with no intention of MODDING the car since I'm not very mod saavy. But the M3 I bought has eisenmann exhaust and catless dps. My question is if I swap back on the stock downpipes will I pass smog in CA ? Also will the CEL go away once I put the stock down pipes back on?
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