Down Pipes Have A Leak?

Goraiders21 · 06-09-2012, 01:58 PM

Hello all, I was wondering how can you tell if downpipes have a leak or are cracked in any way prior to installing them on my 335.

I amy buying a used set and want to ensure that they are in good working condition before I pay to have them installed.

can anyone help me out with any suggestions.

thank you

benzy89 · 06-09-2012, 04:26 PM

Easiest way you could tell if there's a leak in the actual DP is poor some water in it, see if it leaks out of the side walls of the pipe or near the o2 sensors. If the DPs are "leak free", buy some new DP gaskets (~$20) to make sure you've got a quality seal.

Goraiders21 · 06-09-2012, 07:08 PM

Ok thank you, I was thinking about doing that with water but then I thought that it may be bad for water to get in there?

Any suggestion on th type of gasket?

Thanks again for your help

benzy89 · 06-09-2012, 08:03 PM

Water is fine, a corrosive liquid (gasoline) would be awful. If you put water in there just make sure its 100% dry before install, dry it out w/ compressed air from gas station. If you need replacement gaskets, BMS & AR sell them, but you could also get generic AutoZone/NAPA gaskets as long as they fit appropriately.

Goraiders21 · 06-09-2012, 09:34 PM

Perfect thanks again

06-09-2012, 01:58 PM	#1
Goraiders21 Entizy 7 31 Rep 256 Posts Drives: C63 Coupe, Retired M6, 335i Join Date: Jan 2009 Location: Southern Orange County iTrader: (2)	Down Pipes Have A Leak? Hello all, I was wondering how can you tell if downpipes have a leak or are cracked in any way prior to installing them on my 335. I amy buying a used set and want to ensure that they are in good working condition before I pay to have them installed. can anyone help me out with any suggestions. thank you __________________ Muffler Delete / Tiag&Cf Aero Lip / CF M3 Lip / CF Mirror Covers / CF Roof / Blacked Out: Grill, Tail lights, Window Trim, Powder Coated Rims / CF Emblems
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06-09-2012, 04:26 PM	#2
benzy89 Banned 79 Rep 2,396 Posts Drives: '08 E90 335i Join Date: Jan 2012 Location: Northern NJ iTrader: (3) Garage List 2008 BMW 335i [7.50]	Easiest way you could tell if there's a leak in the actual DP is poor some water in it, see if it leaks out of the side walls of the pipe or near the o2 sensors. If the DPs are "leak free", buy some new DP gaskets (~$20) to make sure you've got a quality seal.
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06-09-2012, 07:08 PM	#3
Goraiders21 Entizy 7 31 Rep 256 Posts Drives: C63 Coupe, Retired M6, 335i Join Date: Jan 2009 Location: Southern Orange County iTrader: (2)	Ok thank you, I was thinking about doing that with water but then I thought that it may be bad for water to get in there? Any suggestion on th type of gasket? Thanks again for your help __________________ Muffler Delete / Tiag&Cf Aero Lip / CF M3 Lip / CF Mirror Covers / CF Roof / Blacked Out: Grill, Tail lights, Window Trim, Powder Coated Rims / CF Emblems
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06-09-2012, 08:03 PM	#4
benzy89 Banned 79 Rep 2,396 Posts Drives: '08 E90 335i Join Date: Jan 2012 Location: Northern NJ iTrader: (3) Garage List 2008 BMW 335i [7.50]	Water is fine, a corrosive liquid (gasoline) would be awful. If you put water in there just make sure its 100% dry before install, dry it out w/ compressed air from gas station. If you need replacement gaskets, BMS & AR sell them, but you could also get generic AutoZone/NAPA gaskets as long as they fit appropriately.
	Appreciate 0 Quote

06-09-2012, 09:34 PM	#5
Goraiders21 Entizy 7 31 Rep 256 Posts Drives: C63 Coupe, Retired M6, 335i Join Date: Jan 2009 Location: Southern Orange County iTrader: (2)	Perfect thanks again __________________ Muffler Delete / Tiag&Cf Aero Lip / CF M3 Lip / CF Mirror Covers / CF Roof / Blacked Out: Grill, Tail lights, Window Trim, Powder Coated Rims / CF Emblems
	Appreciate 0 Quote