Love this controller and the fact you can buy a replacement car warranty through Carbahn. I’ve only been able to use it up to 93 octane but even at 91 it is a noticeable difference. Waiting for their e85 kit to come out!

It was very easy to install and fits and looks great.

Does not for the car - filter looks defective - I emailed asking for a return label and a refund and I am waiting to hear back.

I'm thrilled with the increased power! It really woke up my 2021 330i, and using the 93 octane map provides a significant boost while still feeling smooth for daily driving. The Tuning Pro app is simple to use and makes it very easy to switch maps or configure the warmup timer for added engine protection.

High quality products for your high end vehicle. Great customer service!

Took a while to get someone to call me back, but thankfully they coordinated with one another after calling back and mentioning this, and they immediately got back with me and walked me through all my concerns and skepticism.

Product description misled me to purchase a part that doesn't fit on my car despite your website saying it does.

Excellent experience with CarBahn. Shipping and customer service were great!

Beautiful fit and finish, and marked improvement in torsional stiffness in the front end of my M4 Competition. The fact that it has less mass than the OEM braces is just a bonus :-)

My experience with Carbahn has been excellent. Zach has been great — responsive, knowledgeable, and always willing to answer my questions. Ordering was smooth, shipping was quick, and the products are exactly as described. Appreciate the solid customer service and support!

Customer service is great, was assisted with a shipping price error. Quick shipping and safely packaged.

I'm sure you have great products but your instructions for pairing leads me to believe I'm going to throw some codes after this install and I can't take that chance. This should probably be a dealership install especially if a code reader is needed to clear codes!

AWESOME GAINS DEFINTLY CAN FEEL THE DIFFERENCE

Perfect fit and already noticing the engine breathe better and receiving more airflow over the stock filters

Fast shipping and great quality products.

Delivered on time and fit was perfect

Quick ship!

These fit my 2020 m550 perfectly.

Spoiler was shipped very well protected! No damage once so ever! Spoiler looks great!

Not typing again Build quality 5 stars Instructions 1 star (even the link was just a previe. Virtually no instructions, not even a step by step youtube. With no instructions this is for very experienced home mechanics that dealt with all kinds junk. Tricks of the trade, Even the valve controller had no detail install and comes with extra parts, so you have to test fit a few times. The stickers would of been great if you didn't only use 4 letters. Repeating didn't help at all. Need to tell customer they need new donut gaskets, cause used are going to cause a leak most likely. Also recommend replace downpipe to mide pile 4 nuts. Good how to to adjust, its awesome the outer have 360 rotation on ball connection. Need like go no go blocks to air in a starting point. Glad I am skilled, but if you only do basi. Maintenance. I recommend a shop.