Secondary cat delete, 409 SS tubing?

E93Blackhawk · 12-10-2012, 10:46 AM

Hi there guys

Stock 335i apart from JB4 BMS DCI.

Im getting on the golf tee mod but I'm also going to a sec cat delete for a bit of a louder throatier sound, gonna weld them back on when i get catless DP's.

I have a e92.

What is the diameter of the piping needed?

and I've heard the factory use 409 SS tubing? If not what would be okay to use? thanks

E93Blackhawk · 12-10-2012, 10:53 AM

I think its 2.5" piping?

The e92 as far as I'm aware has no resonator.

Never really got under my car to have a look at the OEM setup, but as far as i can see, the primary cats are at the top, then you have a x pipe sort of, more piping then to the muffler.

http://www.e90post.com/forums/showthread.php?t=386902

Heres a guy selling his setup, but can someone advise me weather the pieces on the left are the primaries and in the middle are those the secondaries?

thanks guys.

Wedge1967 · 12-10-2012, 10:54 AM

I think you'll find it's 60mm

enrita · 12-11-2012, 02:40 AM

waste of money, just get the dps and leave the stock exhaust.

gregnm369 · 12-11-2012, 02:41 AM

Quote:

Originally Posted by E93Blackhawk

Hi there guys

Stock 335i apart from JB4 BMS DCI.

Im getting on the golf tee mod but I'm also going to a sec cat delete for a bit of a louder throatier sound, gonna weld them back on when i get catless DP's.

I have a e92.

What is the diameter of the piping needed?

and I've heard the factory use 409 SS tubing? If not what would be okay to use? thanks

Use the JB4 to keep CAN flap open, and you won't need the golf tee mod

E93Blackhawk · 12-11-2012, 03:20 AM

Quote:

Originally Posted by enrita

waste of money, just get the dps and leave the stock exhaust.

I can't afford them hence the temporary sec cat del.

demontwinz · 12-11-2012, 06:53 AM

try to golf tee mod first. I have Can flap open and it's not too bad. I am putting on DP next month and I don't want the crazy smell.

M3_Dylan · 12-11-2012, 08:04 AM

Save the money your gunna spend on the sec car delete and put that toward dps... Do it right the first time even of it takes a little longer

E93Blackhawk · 12-11-2012, 08:31 AM

Quote:

Originally Posted by Dylan335i

Save the money your gunna spend on the sec car delete and put that toward dps... Do it right the first time even of it takes a little longer

I'm actually trying to keep mods to a minimum as I'm saving up to move into the V8 world of a m3

I know ill probably get bashed for this one, but maybe a M6...

that v10 is a thing of beauty.

JamesM3M5 · 12-11-2012, 08:38 AM

304 SS is fine to use, provided the welder uses proper welding techniques. 409 has a higher iron content which makes it tougher, but it corrodes more than 304. However, 304 can crack over time, especially at the welds.

But otherwise, the primary cats are more restrictive than the secondaries. I'd rather remove the stock DPs than take the time/money to remove secondary cats as far as power upgrades go.

E93Blackhawk · 12-11-2012, 08:42 AM

Quote:

Originally Posted by JamesM3M5

304 SS is fine to use, provided the welder uses proper welding techniques. 409 has a higher iron content which makes it tougher, but it corrodes more than 304. However, 304 can crack over time, especially at the welds.

But otherwise, the primary cats are more restrictive than the secondaries. I'd rather remove the stock DPs than take the time/money to remove secondary cats as far as power upgrades go.

Thanks a lot for clearing that up.

Finding it hard to get 409 actually in the UK, maybe 304 will be easier

E93Blackhawk · 12-11-2012, 08:45 AM

Does anyone know how long the pipe will need to be to cover both cats?

Obviously there both on a bend, so I'm guessing ill need a bit more.

Can anyone chime in?

M3_Dylan · 12-11-2012, 11:39 AM

Quote:

Originally Posted by E93Blackhawk

I'm actually trying to keep mods to a minimum as I'm saving up to move into the V8 world of a m3

I know ill probably get bashed for this one, but maybe a M6...

that v10 is a thing of beauty.

Ah I see in that case save it up! I would mind to be rolling in an M6

12-10-2012, 10:46 AM	#1
E93Blackhawk First Lieutenant 31 Rep 344 Posts Drives: 2008 335i M sport Join Date: Oct 2011 Location: London iTrader: (0)	Secondary cat delete, 409 SS tubing? Hi there guys Stock 335i apart from JB4 BMS DCI. Im getting on the golf tee mod but I'm also going to a sec cat delete for a bit of a louder throatier sound, gonna weld them back on when i get catless DP's. I have a e92. What is the diameter of the piping needed? and I've heard the factory use 409 SS tubing? If not what would be okay to use? thanks
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12-10-2012, 10:53 AM	#2
E93Blackhawk First Lieutenant 31 Rep 344 Posts Drives: 2008 335i M sport Join Date: Oct 2011 Location: London iTrader: (0)	I think its 2.5" piping? The e92 as far as I'm aware has no resonator. Never really got under my car to have a look at the OEM setup, but as far as i can see, the primary cats are at the top, then you have a x pipe sort of, more piping then to the muffler. http://www.e90post.com/forums/showthread.php?t=386902 Heres a guy selling his setup, but can someone advise me weather the pieces on the left are the primaries and in the middle are those the secondaries? thanks guys.
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12-10-2012, 10:54 AM	#3
Wedge1967 Banned 125 Rep 2,172 Posts Drives: '07 e92 AT Sport Montego Blue Join Date: Sep 2011 Location: Portland, OR iTrader: (3)	I think you'll find it's 60mm
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12-11-2012, 02:40 AM	#4
enrita Major General 159 Rep 7,378 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	waste of money, just get the dps and leave the stock exhaust. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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12-11-2012, 06:53 AM	#7
demontwinz Lieutenant 18 Rep 456 Posts Drives: 335i e92 Join Date: Sep 2012 Location: Toronto iTrader: (0)	try to golf tee mod first. I have Can flap open and it's not too bad. I am putting on DP next month and I don't want the crazy smell. __________________
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12-11-2012, 08:04 AM	#8
M3_Dylan Lieutenant 32 Rep 520 Posts Drives: 2008 BMW M3 Join Date: Sep 2011 Location: Orlando iTrader: (5)	Save the money your gunna spend on the sec car delete and put that toward dps... Do it right the first time even of it takes a little longer __________________ KW V3's / AA Stage 2 Supercharger / Catless Mid-pipes / AA Mufflers / Apex Arc-8's / PFC 09's
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12-11-2012, 08:38 AM	#10
JamesM3M5 Some dude 91 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	304 SS is fine to use, provided the welder uses proper welding techniques. 409 has a higher iron content which makes it tougher, but it corrodes more than 304. However, 304 can crack over time, especially at the welds. But otherwise, the primary cats are more restrictive than the secondaries. I'd rather remove the stock DPs than take the time/money to remove secondary cats as far as power upgrades go. __________________ RRT E92 335i/6MT with stuff and things
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12-11-2012, 08:45 AM	#12
E93Blackhawk First Lieutenant 31 Rep 344 Posts Drives: 2008 335i M sport Join Date: Oct 2011 Location: London iTrader: (0)	Does anyone know how long the pipe will need to be to cover both cats? Obviously there both on a bend, so I'm guessing ill need a bit more. Can anyone chime in?
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