Downpipe Questions? - BMW 3-Series (E90 E92) Forum

BMOEW · 06-25-2009, 10:07 AM

I was wondering, (am new to moding) but whats the point of a downpipe, any HP gain and ect. Do they void warranty? Do they fit on stock exhaust? Whats the O2 simulator and the use for it? Does a downpipe work with the JB3 or do u need something to help it work with it?
Thanks in advance

ragingclue · 06-25-2009, 10:10 AM

wow.

cbad335 · 06-25-2009, 11:07 AM

I suggest you learn to

here. All the answers you seek are covered many times over in previous posts.

ar design · 06-25-2009, 12:14 PM

Quote:

Originally Posted by BMOEW

I was wondering, (am new to moding) but whats the point of a downpipe, any HP gain and ect. Do they void warranty? Do they fit on stock exhaust? Whats the O2 simulator and the use for it? Does a downpipe work with the JB3 or do u need something to help it work with it?
Thanks in advance

Downpipes free up some horsepower, we typically quote 20-30hp, but have seen dynos with quite a bit more. Our 3" downpipes mate to the stock exhaust. We carry the BMS o2 sims, and also the JB3. JB3s LOVE downpipes, just like any other tune

Drakos · 06-25-2009, 12:17 PM

+1 for AR downpipes

I got mine installed yesterday and they rock. You WILL feel the gain. Any mod can be suspect for warranty. It will depend on the dealer. I will take my car in to a dealer that specializes in performance modifications. You can bet that there will be a handful of Dinan stage 2 customers with DP's

SV Concepts III · 06-25-2009, 12:28 PM

The factory downpipes are very restrictive so aftermarket versions are larger and are freer flowing than the standard OEM units. Removing the cats helps improve flow further although you do need an O2 simulator to prevent the check engine light. They are fully compatible with the JB3 tune and JB3 has built in maps to take advantage of the improved flow from a downpipe.

I am running the Riss Racing downpipes and have had substantial gains along with an exhaust and ECU tune. I highly recommend them if you want to improve performance and get the added benefit of a deeper tone.

ar design · 06-25-2009, 01:03 PM

Quote:

Originally Posted by Drakos

+1 for AR downpipes

I got mine installed yesterday and they rock.

ianthegreat · 06-25-2009, 01:25 PM

Quote:

Originally Posted by ragingclue

wow.

Aside from tunes, dp's have to be the one of the most talked about subjects, behind HPFP's of course.

roozie2001 · 06-25-2009, 03:03 PM

i ordered my DPs from VK Motorsports. they recently had a group buy for a real good price. if u search VK motorsports or downpipes u might still be able to tag on. But one thing i can tell u is im not putting on my DPs until i get an intercooler. FMIC and an oil cooler are my next mods, and soon as someone makes a high capacity radiator thats next. The biggest issue with these cars isnt flow of air. Its cooling and fuel.

Autobahn335i · 06-25-2009, 04:53 PM

Do catted dps have an effect on the exhaust sound of the car?

ar design · 06-25-2009, 05:08 PM

Not really, no.

06-25-2009, 10:07 AM	#1
BMOEW Major Drives: 2007 bmw 335i alpine white Join Date: Apr 2009 Location: dallas, tx: Lebanon Posts: 1,084 iTrader: (6)	Downpipe Questions? I was wondering, (am new to moding) but whats the point of a downpipe, any HP gain and ect. Do they void warranty? Do they fit on stock exhaust? Whats the O2 simulator and the use for it? Does a downpipe work with the JB3 or do u need something to help it work with it? Thanks in advance
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06-25-2009, 11:07 AM	#3
cbad335 Lieutenant Colonel Drives: '09 E92 335i Join Date: Jan 2008 Location: Cardiff-by-the-Sea, CA Posts: 1,733 iTrader: (17) Garage List 2009 BMW 335i Coupe [5.00]	I suggest you learn to here. All the answers you seek are covered many times over in previous posts. __________________ \| 6MT \| ZSP \| ZPP \|

06-25-2009, 12:17 PM	#5
Drakos Lieutenant Drives: 09 335xi E90/13 X5 35i M Sport Join Date: May 2009 Location: Canada Posts: 509 iTrader: (1)	+1 for AR downpipes I got mine installed yesterday and they rock. You WILL feel the gain. Any mod can be suspect for warranty. It will depend on the dealer. I will take my car in to a dealer that specializes in performance modifications. You can bet that there will be a handful of Dinan stage 2 customers with DP's __________________ Cobb S2+ \| AR DP \| Helix FMIC \| BMS DCI \| Forge DV \| ER UCP \| KW V1 \| BMW Performance Exhaust \| P3 DBG \|

06-25-2009, 03:03 PM	#9
roozie2001 Just some guy Drives: 2008 White 335i sedan Join Date: Apr 2008 Location: Houston, TX Posts: 1,529 iTrader: (4)	i ordered my DPs from VK Motorsports. they recently had a group buy for a real good price. if u search VK motorsports or downpipes u might still be able to tag on. But one thing i can tell u is im not putting on my DPs until i get an intercooler. FMIC and an oil cooler are my next mods, and soon as someone makes a high capacity radiator thats next. The biggest issue with these cars isnt flow of air. Its cooling and fuel. __________________ 2008 BMW 335i/Sedan/Alpine White/Terra/Steptronic/Premium Package/Sports package/Comfort Access/USB/Sirius

06-25-2009, 04:53 PM	#10
Autobahn335i Major Drives: E92 335i Join Date: Mar 2009 Location: Luxembourg Posts: 1,357 iTrader: (4)	Do catted dps have an effect on the exhaust sound of the car? __________________ E92 335i SB / Black Leather / 6AT / Navi Prof / Sunroof / Active Steering Mods: Performance Seats / Performance Exhaust / RB Turbos / Brembo GT BBK 355/345 / Forge FMIC / QUAIFE LSD / Bilstein PSS10 / M3 Suspension Parts / Vorshlag Camberplates / RE Toe Links / LeatherZ Gauges / Extended M3 DCT Paddles / ER Sports OC / AR OC / Aux Radiator / AR DPs / Alpina TCU Flash / COBB Pro-Tune Next: Transmission cooler / M3 CF Roof

06-25-2009, 10:10 AM	#2
ragingclue My interior is turrible Drives: stickferanaxle Join Date: Oct 2008 Location: mulletville Posts: 6,667 iTrader: (1)	wow.

06-25-2009, 12:28 PM	#6
SV Concepts III Lieutenant General Drives: BMW Duh Join Date: Apr 2005 Location: Santa Clara Posts: 17,029 iTrader: (13)	The factory downpipes are very restrictive so aftermarket versions are larger and are freer flowing than the standard OEM units. Removing the cats helps improve flow further although you do need an O2 simulator to prevent the check engine light. They are fully compatible with the JB3 tune and JB3 has built in maps to take advantage of the improved flow from a downpipe. I am running the Riss Racing downpipes and have had substantial gains along with an exhaust and ECU tune. I highly recommend them if you want to improve performance and get the added benefit of a deeper tone.

06-25-2009, 05:08 PM	#11
ar design BimmerPost Supporting Vendor Drives: '86 325ES+S50, '01 TT QC Join Date: Jan 2008 Location: Denver, CO Posts: 4,535 iTrader: (9) Garage List 1965 Mercedes 190c [0.00] 1986 BMW 325ES [0.00] 2001 Audi TT Quattro [5.00]	Not really, no.

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