Downpipe Questions?

BMOEW · 06-25-2009, 11:07 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, 11:10 AM

wow.

cbad335 · 06-25-2009, 12:07 PM

I suggest you learn to

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

ar design · 06-25-2009, 01:14 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, 01:17 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, 01:28 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, 02:03 PM

Quote:

Originally Posted by Drakos

+1 for AR downpipes

I got mine installed yesterday and they rock.

ianthegreat · 06-25-2009, 02:25 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, 04:03 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.

TurboBimmer · 06-25-2009, 05:53 PM

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

ar design · 06-25-2009, 06:08 PM

Not really, no.

06-25-2009, 11:07 AM	#1
BMOEW Lieutenant Colonel 121 Rep 1,665 Posts Drives: 2011 335is AW Join Date: Apr 2009 Location: dallas, tx: Lebanon 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, 11:10 AM	#2
ragingclue One cam is enough 136 Rep 6,801 Posts Drives: VF Join Date: Oct 2008 Location: mulletville iTrader: (1)	wow.
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06-25-2009, 12:07 PM	#3
cbad335 Lieutenant Colonel 62 Rep 1,739 Posts Drives: '09 E92 335i Join Date: Jan 2008 Location: Cardiff-by-the-Sea, CA iTrader: (17) Garage List 2009 BMW 335i Coupe [7.34]	I suggest you learn to here. All the answers you seek are covered many times over in previous posts. __________________ \| 6MT \| ZSP \| ZPP \|
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06-25-2009, 01:17 PM	#5
Drakos Lieutenant 68 Rep 534 Posts Drives: 2022 G42 M240i Join Date: May 2009 Location: Canada 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
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06-25-2009, 01:28 PM	#6
SV Concepts III Lieutenant General 380 Rep 16,968 Posts Drives: BMW Duh Join Date: Apr 2005 Location: Santa Clara 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.
	Appreciate 0 Quote

06-25-2009, 04:03 PM	#9
roozie2001 Just some guy 49 Rep 1,531 Posts Drives: 2008 White 335i sedan Join Date: Apr 2008 Location: Houston, TX 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
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06-25-2009, 05:53 PM	#10
TurboBimmer Lieutenant Colonel 78 Rep 1,617 Posts Drives: F82 M4 Join Date: Mar 2009 Location: Luxembourg iTrader: (5)	Do catted dps have an effect on the exhaust sound of the car? __________________ Performance Seats, Exhaust, Splitters, Pedals, Steering Wheel / RB Turbos / M3 CF Roof / Brembo GT BBK 355/345 / Rollcage / Forge FMIC / Quaife LSD / Öhlins Road & Track / M3 Suspension Parts / Solid Subframe Bushings / Vorshlag Camberplates / Megan Racing Toe Links / LeatherZ Gauges / Extended M3 DCT Paddles / ER Sports OC / AR OC / Aux Radiator / AR DPs / Alpina TCU / COBB Pro-Tune
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06-25-2009, 06:08 PM	#11
ar design 302 Rep 4,408 Posts Drives: 04 M3 Join Date: Jan 2008 Location: Denver, CO iTrader: (9)	Not really, no. __________________ -Critter
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