Catted Downpipe Power increase?

Randy Johnson · 10-07-2019, 06:08 PM

I have a 435i with BM3 stage one. What kind of increase in power can I expect if I add a catted high flow downpipe? I am interested in a VRSF pipe.

n55david · 10-07-2019, 07:50 PM

A small one

johnung · 10-07-2019, 10:26 PM

Quote:

Originally Posted by Randy Johnson

I have a 435i with BM3 stage one. What kind of increase in power can I expect if I add a catted high flow downpipe? I am interested in a VRSF pipe.

You will definitely get a power increase because there is less back pressure on the turbo and the BootMod3 Stage2 tune will take advantage of it. Upgrade your plugs to NGK 97506 gapped down to 0.022". Change them every 20k miles after.

mike@x-ph.com · 10-08-2019, 10:20 AM

Quote:

Originally Posted by Randy Johnson

I have a 435i with BM3 stage one. What kind of increase in power can I expect if I add a catted high flow downpipe? I am interested in a VRSF pipe.

Power will increase but not by much, you need to run stage 2 to feel the increase. Or better get a custom tune

pw0n · 10-08-2019, 12:57 PM

Quote:

Originally Posted by johnung

You will definitely get a power increase because there is less back pressure on the turbo and the BootMod3 Stage2 tune will take advantage of it. Upgrade your plugs to NGK 97506 gapped down to 0.022". Change them every 20k miles after.

johnung, FCP Euro lists the NGK 97506 as not compatible w/ the 435i N55. Same goes for ECS Tuning. Do they have it listed incorrectly?

https://www.fcpeuro.com/products/bmw...plug-ngk-96987

McLaren720s · 10-08-2019, 01:19 PM

Quote:

Originally Posted by pw0n

johnung, FCP Euro lists the NGK 97506 as not compatible w/ the 435i N55. Same goes for ECS Tuning. Do they have it listed incorrectly?

https://www.fcpeuro.com/products/bmw...plug-ngk-96987

I have them listed here as compatible:

https://www.ecstuning.com/b-ngk-part...f-six/97506kt/

n55david · 10-08-2019, 01:30 PM

Quote:

Originally Posted by pw0n

johnung, FCP Euro lists the NGK 97506 as not compatible w/ the 435i N55. Same goes for ECS Tuning. Do they have it listed incorrectly?

https://www.fcpeuro.com/products/bmw...plug-ngk-96987

They are fine they just dont match the stock plug spec is why.

mlev · 10-08-2019, 01:53 PM

Quote:

Originally Posted by pw0n

johnung, FCP Euro lists the NGK 97506 as not compatible w/ the 435i N55. Same goes for ECS Tuning. Do they have it listed incorrectly?

https://www.fcpeuro.com/products/bmw...plug-ngk-96987

I would recommend verifying fitment on the manufacturer website:
https://www.ngk.com/product.aspx?zpid=41489
97506 is compatible with all N55 / S55 / S63TU
https://bootmod3.atlassian.net/wiki/...+and+which+gap

Randy Johnson · 10-10-2019, 09:50 AM

The NGK 97506 are listed on the Pro Tuning Freaks web site. They are compatible and I've ordered them. Once I get the DP and plugs I will be tuning with stage 2 or possibly custom.

I'm also hoping the car sounds better. It sounds ok now by just way to quiet.

https://bootmod3.atlassian.net/wiki/...+and+which+gap

Jeff@TopGearSolutions · 10-11-2019, 04:05 PM

We offer the 97506 and 95770. The reason another website may not show them as compatible is they require gapping which most end consumers don't do/aren't used to. It also could just be outdated information.

XutvJet · 10-12-2019, 10:17 AM

There are dynos out there showing a 20-25whp/wtq gain by simply adding a catted DP (Fabspeed) and no tune. My M235 picked up a nice gain with the HJS Euro 6 300 cell DP. There's a good bit more throttle response and the sound improvement is worth the price alone.

ceedawg · 10-13-2019, 07:00 AM

Quote:

Originally Posted by XutvJet

There are dynos out there showing a 20-25whp/wtq gain by simply adding a catted DP (Fabspeed) and no tune. My M235 picked up a nice gain with the HJS Euro 6 300 cell DP. There's a good bit more throttle response and the sound improvement is worth the price alone.

I concur especially on the stg 2 map I noticed a stark difference when I added the fabspeed cat. Beast on the E30 map.

10-07-2019, 06:08 PM	#1
Randy Johnson M340i 393 Rep 969 Posts Drives: BMW M340i Join Date: Sep 2019 Location: South FLA iTrader: (1) Garage List 2021 BMW M340i [10.00]	Catted Downpipe Power increase? I have a 435i with BM3 stage one. What kind of increase in power can I expect if I add a catted high flow downpipe? I am interested in a VRSF pipe.
	Appreciate 0 Tweet Quote

10-07-2019, 07:50 PM	#2
n55david Check out my Youtube @n55david! 1296 Rep 3,533 Posts Drives: 2017 m240i, 2015 X3 x35i Join Date: Aug 2018 Location: Michigan USA iTrader: (0) Garage List 2017 m240i xDrive [0.00] 2015 X3 x35i [0.00] 2015 335i xdrive [0.00]	A small one
	Appreciate 2 IK6SPEED4488.00 BMWILUVU809.00 Quote

10-10-2019, 09:50 AM	#9
Randy Johnson M340i 393 Rep 969 Posts Drives: BMW M340i Join Date: Sep 2019 Location: South FLA iTrader: (1) Garage List 2021 BMW M340i [10.00]	The NGK 97506 are listed on the Pro Tuning Freaks web site. They are compatible and I've ordered them. Once I get the DP and plugs I will be tuning with stage 2 or possibly custom. I'm also hoping the car sounds better. It sounds ok now by just way to quiet. https://bootmod3.atlassian.net/wiki/...+and+which+gap
	Appreciate 0 Quote

10-11-2019, 04:05 PM	#10
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	We offer the 97506 and 95770. The reason another website may not show them as compatible is they require gapping which most end consumers don't do/aren't used to. It also could just be outdated information.
	Appreciate 0 Quote

10-12-2019, 10:17 AM	#11
XutvJet Major General 5556 Rep 5,372 Posts Drives: 2011 Cayman Base, 2016 M235 Join Date: Mar 2016 Location: Kansas City iTrader: (-1)	There are dynos out there showing a 20-25whp/wtq gain by simply adding a catted DP (Fabspeed) and no tune. My M235 picked up a nice gain with the HJS Euro 6 300 cell DP. There's a good bit more throttle response and the sound improvement is worth the price alone.
	Appreciate 1 ceedawg467.50 Quote