Life of BMW Performance Exhaust

mapleridge · 04-29-2011, 11:57 PM

Hi Guys,

I know this question warrants a somewhat "it depends" answer. Humidity, salt on roads etc. The reason I ask is that there are used ones popping up here and there and I want to know what to expect out of a used one.

Express · 04-29-2011, 11:59 PM

well to indirectly answer your question.....

shorter trips is what affect most exhaust systems most. short trips = more condensation = more water. the shortness of the trip sometimes does not allow all of the water to burn up and exit the system, letting it pool up inside.

mapleridge · 04-30-2011, 12:30 PM

What would the pooling of the water do to it though?

rigdowntex · 04-30-2011, 12:33 PM

metal + water = rust

Dark_Knight_335 · 04-30-2011, 12:36 PM

Express nailed it. 110% correct. The man knows!

mapleridge · 04-30-2011, 01:58 PM

Certain types of metal + Water = Rust.

I thought these units were stainless. Doesn't that protect them from rust?

mike-y · 04-30-2011, 03:21 PM

if it's stainless, it should last for a very long time. at least as long as a normal factory exhaust system. Honestly, I wouldn't worry about it, assuming it's stainless.

mapleridge · 04-30-2011, 04:56 PM

Well that deals with the corrosion/rust issue, but what actually make an exhaust system wear out?

Dr. Nate · 05-01-2011, 10:39 AM

Quote:

Originally Posted by mapleridge

Well that deals with the corrosion/rust issue, but what actually make an exhaust system wear out?

Type of fuel, exhaust gas temperatures, milage, and environment. Not all stainless steel is safe from rusting, a lot of companies use cheaper stainless that isn't as good or use aluminized which they pass of ass stainless. I doubt BMW does that though.

-Nate

mapleridge · 05-01-2011, 01:20 PM

I guess it does all go back to "it depends" but the variables are a lot clearer now. To have a clearer idea of water build up inside and such I need to see what the inside of an exhaust system looks like and the way they work.

Anyone have an article or link to some good reading?

04-29-2011, 11:57 PM	#1
mapleridge Banned 151 Rep 2,638 Posts Drives: E90 N52 AT Join Date: Apr 2011 Location: Vancouver, BC iTrader: (4)	Life of BMW Performance Exhaust Hi Guys, I know this question warrants a somewhat "it depends" answer. Humidity, salt on roads etc. The reason I ask is that there are used ones popping up here and there and I want to know what to expect out of a used one.
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04-29-2011, 11:59 PM	#2
Express Major General 369 Rep 8,693 Posts Drives: 06 330i Join Date: Dec 2008 Location: The Promise Land iTrader: (17) Garage List 2006 BMW 330i [8.30]	well to indirectly answer your question..... shorter trips is what affect most exhaust systems most. short trips = more condensation = more water. the shortness of the trip sometimes does not allow all of the water to burn up and exit the system, letting it pool up inside.
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04-30-2011, 12:30 PM	#3
mapleridge Banned 151 Rep 2,638 Posts Drives: E90 N52 AT Join Date: Apr 2011 Location: Vancouver, BC iTrader: (4)	What would the pooling of the water do to it though?
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04-30-2011, 12:33 PM	#4
rigdowntex Private 10 Rep 83 Posts Drives: 2016 M4 Join Date: Dec 2010 Location: Pipe Creek TX iTrader: (0)	metal + water = rust
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04-30-2011, 12:36 PM	#5
Dark_Knight_335 Came to the N55 Darkside 1112 Rep 12,740 Posts Drives: 2011 335 E93 M-Sport Join Date: May 2010 Location: NY/NJ iTrader: (28)	Express nailed it. 110% correct. The man knows!
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04-30-2011, 01:58 PM	#6
mapleridge Banned 151 Rep 2,638 Posts Drives: E90 N52 AT Join Date: Apr 2011 Location: Vancouver, BC iTrader: (4)	Certain types of metal + Water = Rust. I thought these units were stainless. Doesn't that protect them from rust?
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04-30-2011, 03:21 PM	#7
mike-y just another bmw douche bag 195 Rep 3,640 Posts Drives: 1.9L of fury Join Date: Nov 2008 Location: Los Angeles, CA iTrader: (4)	if it's stainless, it should last for a very long time. at least as long as a normal factory exhaust system. Honestly, I wouldn't worry about it, assuming it's stainless.
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04-30-2011, 04:56 PM	#8
mapleridge Banned 151 Rep 2,638 Posts Drives: E90 N52 AT Join Date: Apr 2011 Location: Vancouver, BC iTrader: (4)	Well that deals with the corrosion/rust issue, but what actually make an exhaust system wear out?
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05-01-2011, 01:20 PM	#10
mapleridge Banned 151 Rep 2,638 Posts Drives: E90 N52 AT Join Date: Apr 2011 Location: Vancouver, BC iTrader: (4)	I guess it does all go back to "it depends" but the variables are a lot clearer now. To have a clearer idea of water build up inside and such I need to see what the inside of an exhaust system looks like and the way they work. Anyone have an article or link to some good reading?
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