The intake side egr tends to crack as it is, so if you leave it there only bolted on at the exhaust manifold end and blocking it at the intake end the chance of it cracking goes up significantly since it would just be one long accordion arm bouncing up and down.

you probably also lose some responsiveness since exhaust gases have a large chamber to expand into when you accelerate as opposed to going straight into the turbo and spooling the turbine.

for 15 bucks you can get the ali express race pipe piece that comes with everything but you do lose the 4th support leg for the intake box. for me it does not cause any issues.

if you have the extra dough I would look at the orion diesel egr delete pipe which has the bonus of removing the ASV as well as the shitty intake connection and gaskets that cost 15 bucks a piece to replace.

not sure if DUDMD's tune deletes the ASV but it sounds like a really good idea. I would love to remove mine.

https://www.dieselops.com/orion-dies...-x5d-2009-2012

Just so happens I log on this morning and at the top of this section is a thread about the egr cooler cracking at the accordion and a bunch of people saying it's happened to them multiple times. That's enough for me to order the kit right there.

I saw the dieselops one on their site and actually prefer the bimmertune one they offer. I look at the ASV as a safety feature. In the slim chance of a runnaway, turning the engine off should close the plate on the ASV and help cutoff the engine before any serious damage is done. I think if this were to happen I would have the sense of mind to put it in neutral so it stops acceleration, but I can't say I have the same confidence in my wife's mindset where she might just hit the brake and hold on tight.

Thais a very valid point

So I spent the evening reading about the ASV and its function. When the ignition is turned off the ecu sends vacuum to close the flap so the engine shuts off smoothly without shutter. Hence the name.

Where the debate comes in is that the vacuum is only held for around 1 second, after that the flap opens.

Some say in a runaway situation that second will be enough to stop it, others laugh at that thought and say it will continue as soon as that flap cracks open again.

Just about all agree that a CO2 fire extinguisher into the intake will choke the engine and stop it. So mounting one in the trunk could take away any worry and allow another restrictive piece to be removed.

I chatted with DUDMD and he can remove it with his tune as well.

In the situation of a runaway your wife’s mindset would stall the engine much better than you throwing it into neutral and letting it free rev without any gears to hold it. In the automatic though both would sadly be futile.

Before you respond, I’ve had a runaway in a diesel. There wasn’t an ASV, but I do keep the Halotron fire extinguisher in that vehicle for HOPEFULLY choking the engine if Murphy comes around.

It's an automatic, my thought process of sticking it in neutral is to stop it from launching forward into whatever may be in front of me at 100mph. Rather blow the engine than kill someone.

I've been 2-3 days now on the fence on whether to delete the ASV at the same time as the EGR or not. I've read countless threads and there's so many conflicting views on the subject.

Oh you’re one of those guys trying not to hurdle into traffic. ;)

It’s too bad no one has done a dyno with an ASV and without. I would have liked to have seen that choke it out when I chunked that engine.

Yessir, prefer not to be a human rocket launcher! :p

I'd love to see a dyno with vs without as well to see the actual difference the ASV makes. The guys at dieselops say it's significant enough.

I don't worry about a runaway in the sense of overfueling. Our engines aren't mechanically injected, shut it off and the fuel cuts off. Where I worry is simply in the case of a turbo letting go and supplying a secondary fuel source.

I might just be oversensitive at this moment because I'm currently dealing with a blown turbo on my f150 which has lower millage than the x5.

After a few days of back and forth debating with myself, I couldn't get past the possibility of a blown turbo causing a runaway without the ASV in place, so I ended up ordering the bimmertunes EGR delete kit also through dieselops.

I chatted about ASV with Dmitry (DUDMD Tuning). His opinion was that deleting ASV is not worth it. He does have a dyno in his garage, not sure if the opinion was from performance perspective or safety.