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08-25-2025LAST POST
deansbimmer wrote
We’re shipping backorders currently. This batch took a long time to manufacture and have coated- there was a period we had no inventory.
Awesome! Much anticipation!
All backorders have been processed and these are available again, in stock, for quick shipment!
deansbimmer wrote
All backorders have been processed and these are available again, in stock, for quick shipment!
Got mine in the mail last week!

Haven't had a chance to install yet.
Looking at purchasing soon, question - I don't see the bowden cables being used in any of the pictures in this thread or on your website - do you provide your own, do you use a different manner of attachment to the aluminum (BMW) bracket? Or you bypass?

Also- the stock pan, specifically where the opening is for oil cooling, seems to be shaped a certain way. To me, it looks like it could be done so in order to direct airflow upwards into radiator. Your panel is perfectly flat. I know you didn't test in wind tunnel, but did you entertain this difference while designing?

Thanks!
TboneS54 wrote
Looking at purchasing soon, question - I don't see the bowden cables being used in any of the pictures in this thread or on your website - do you provide your own, do you use a different manner of attachment to the aluminum (BMW) bracket? Or you bypass?

Also- the stock pan, specifically where the opening is for oil cooling, seems to be shaped a certain way. To me, it looks like it could be done so in order to direct airflow upwards into radiator. Your panel is perfectly flat. I know you didn't test in wind tunnel, but did you entertain this difference while designing?

Thanks!
The Bowden cables are not used. They are originally purposed to prevent the downward ballooning of the felt panels as air pressure in the engine bay increases at high road speeds- this retention is especially important for damaged panels with damaged or missing attachment points. As the Aluminum panel is rigid and doesn't flex in the same way, it is unnecessary. Additionally, the original Bowden cable length is too long to be effective with the aluminum undertray, due to the increased ground clearance of the flat panel. We recommend omission.

Yes, airflow and cooling was considered with the design. Our undertray has the correct provisions for the oil cooler airflow. Airflow enters from the front of the car at the bumper inlets and travels downward, not vice versa. The radiators are forward-of and above the underpanel, airflow cannot be made to travel upstream. The same airflow path as the OE parts is used with our undertray. In real world testing and reports from owners, we note moderate decreases in oil temps particularly in cars where our undertray replaced damaged or missing OEM panels.

Seeing as most felt underpanel sets are severely compromised and new sets are so easily damaged, this undertray is almost always going to be an improvement to what's probably there.
Thanks for the thorough reply!
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About how long is this item backordered? I was looking at getting one.
M3Dimi wrote
About how long is this item backordered? I was looking at getting one.
They're in stock. I'll adjust the quantities online but you're welcome to go ahead and order one, it'll be processed currently.
I wanted to double check fitment on supercharged e9x (specifically ESS G1). Recently saw a G1 owner selling one on Facebook and he stated it does not fit with the intake in place
deansbimmer wrote
They're in stock. I'll adjust the quantities online but you're welcome to go ahead and order one, it'll be processed currently.
Sounds good I just placed my order.
Soden82 wrote
I wanted to double check fitment on supercharged e9x (specifically ESS G1). Recently saw a G1 owner selling one on Facebook and he stated it does not fit with the intake in place
It fits. I have a G1 and this undertay. No problems at all.
deansbimmer wrote
They're in stock. I'll adjust the quantities online but you're welcome to go ahead and order one, it'll be processed currently.
The website shown out -of -stock again. Do you have an estimate of availability? Any discount for forum member? Thank you
We have them in stock.

As far as discounts...We started offering these years ago at the $400 price and have not raised that price ever since. We, like everyone else have experienced significant rise in costs for aluminum and materials, CNC costs, shipping costs, reduced dollar value, etc. Instead of increasing the price or changing to a thinner aluminum (like other guys) we are absorbing the losses and will continue to offer them at the same fixed price.
Just installed mine last night. The installation instructions are good making it a very easy process to install. Thanks Dean!
this is sooooo nice
Just ordered one of these last Friday - just curious if they are shipping normally or on backorder. Looking forward to replacing the flimsy OEM components that are damaged on my M3. So glad I saw this thread before buying OEM parts to repair things, but inevitably have issues again.
The current batch is in coating, almost done. We're expecting them next week to resume orders.
deansbimmer wrote
The current batch is in coating, almost done. We're expecting them next week to resume orders.
Awesome! Thanks for the update!
deansbimmer wrote
The current batch is in coating, almost done. We're expecting them next week to resume orders.
Just curious to get an updated ETA since it has been a few weeks. I checked the website and see it still shows backorder.
We received the trays back from coating and are assembling orders currently!
Thanks for everyone's patience.
deansbimmer wrote
We received the trays back from coating and are assembling orders currently!
Thanks for everyone's patience.
Awesome! Thanks for the update - I see that I already got a ship notice around an hour ago.
Just wanted to report back after my install - I was impressed when I opened the package with both the finish and how solid the Undertray felt.

The installation process took me a little longer than expected, but everything did line up perfectly by following the instructions.

So glad to have the flimsy felt pieces gone - one of the seals on the original center piece was just gone, some of the plastic as well. One side has a small tear, and the other was almost all missing.

As reported, the engine oil temperature was definitely a bit cooler. Overall a fantastic experience and I would highly recommend it!

For anyone who has done the aero pieces, I'm curious if there is a consensus on the material to use, and is there a specification for the screws?