[jordful]

I wanted to share my experience with BimmerWorld regarding their so-called “N54 Turbo Overhaul Kit” and its misleading warranty coverage—so others don’t end up in the same situation.

I purchased their N54 turbo kit, which included a pair of OEM Mitsubishi N54 turbos and an installation kit. Before pulling the trigger, I chatted with BimmerWorld’s support team directly. I was in the process of comparing their offering to another big-name retailer. That competitor was slightly more expensive, but they included a lifetime warranty, which was a major selling point.

I asked BimmerWorld about their warranty, and the representative assured me the turbos came with a 2-year warranty. That gave me enough confidence to go ahead and complete the transaction. This was a significant purchase—close to $1,750 before install—so knowing the turbos were backed by a 2-year warranty made me feel like my investment was protected. That peace of mind was the main reason I chose BimmerWorld.

The turbos were installed on my 2011 BMW 335is, running the stock factory tune. No piggybacks, no flash tune, no excessive boost. The car was in perfect working order otherwise.

Then—just 4,000 miles later—the rear turbo failed.

Naturally, I went to BimmerWorld’s site again to review their warranty terms. The page still shows a 2-year warranty on this turbo kit, just like many other parts on their site. But here’s the problem: there’s no detailed explanation of the warranty anywhere. No fine print, no breakdown of what is or isn’t covered.
That’s red flag #1.

I reached out to BimmerWorld, expecting the warranty process to be simple, especially since these were OEM turbos on a stock vehicle. To my surprise, I was told the warranty wasn’t actually from BimmerWorld—it was from Mitsubishi, the turbo manufacturer. Suddenly, this wasn’t a BimmerWorld-backed product after all. The “2-year warranty” they marketed wasn’t really theirs—it was Mitsubishi’s, and I would have to go through them for any replacement.
That’s red flag #2.

It feels like a classic bait-and-switch. If you’re going to advertise a “2-year warranty” under your store’s branding, then leave your customer to deal with the manufacturer on their own, you’re not standing behind the product. At all.

Still, I followed the process they outlined. I paid $70 out of pocket to ship the turbos to Mitsubishi for inspection. This alone was frustrating, but I figured it was part of the process and was confident the failure was covered.

Weeks later, I get the verdict: warranty denied.

The reason? According to Mitsubishi, the turbo failed due to “improper heat cycles OR excessive exhaust temperatures.” That’s it. No clear explanation. No detailed findings. Just two vague, unprovable causes that conveniently fall outside of their warranty terms.
That’s red flag #3.

What kind of diagnosis says “or”? That means they’re guessing. That means they don’t actually know, and they’re giving themselves a free pass to deny coverage by citing ambiguous, catch-all phrases that cannot be refuted.

At this point, I contacted BimmerWorld again expecting that, since I’d done everything by the book and followed their guidance, they would try to help resolve the situation—or, at the very least, offer some support.

Instead, I was passed around and spoken to like I had done something wrong. I was told that the turbos could have failed due to “aftermarket tuning” or “modifications,” even though I clearly stated—again and again—that the car was on a stock tune. No meth. No upgraded fueling. No raised boost targets. Nothing outside factory parameters.

At no point did anyone at BimmerWorld take ownership of the issue or try to make it right. No one offered to share the burden. I was met with blame-shifting and insinuations that it must have been something I did wrong—even though the failure was on a car running OEM software.

So what now? I’m out:
• $1,750 for the turbo kit
• $70 in shipping for a failed warranty claim
• And hundreds more in labor for installation and removal

All because a part failed prematurely under normal operating conditions—and the seller refused to stand behind what they sold.
Bottom line:BimmerWorld’s “2-year warranty” on this kit is not a real warranty. It’s a manufacturer warranty with zero transparency, no posted terms, and no guarantee of coverage. BimmerWorld won’t support you if something goes wrong—they’ll just hand it off to Mitsubishi and let you take the hit.

That’s not how a reputable performance parts company should operate. Especially in the BMW community, where trust and technical support matter.

I will never shop with BimmerWorld again and I strongly urge anyone considering this turbo kit—or any high-dollar purchase from them—to look elsewhere unless you’re okay with gambling on expensive parts and getting zero accountability when they fail.

Do yourself a favor: Go with a vendor that actually stands behind their products and doesn’t leave you out to dry when something goes wrong.

[Cloverdale]

Where I live you can represent yourself in a small claims action for a small fee. You must be out a significant amount for labor hours alone. Mitsubishi will be legally obligated to respond and motivated to remedy the issue once served. In the mean time you can still rebuild your original turbo's.

[krhodes1]

Originally Posted by Cloverdale

Where I live you can represent yourself in a small claims action for a small fee. You must be out a significant amount for labor hours alone. Mitsubishi will be legally obligated to respond and motivated to remedy the issue once served. In the mean time you can still rebuild your original turbo's.

Where I live they will almost certainly NOT respond (and good luck properly serving Giant Corp proper legal notice). And then you will get a default judgement. Yay! Which is worth the paper it is printed on, because absent deep pockets to somehow go after them, good luck collecting from a giant corporation. Or they do respond, and their well-paid lawyers squash you like a bug in court.

Situation sucks, learn the lesson and get on with your life. This is one of those cases where if you are having to PAY someone to do the work, you are best off paying the extra to buy the expensive parts from them so that a failure is THIER problem, not YOUR problem. I'm willing to take a chance to save a buck if I am doing the work, but not if I am having to pay labor again if there is a problem.

[e90yyc]

Yo that sucks man… I’m sorry to hear that.

Probably not worth trying to chase Mitsubishi, but good that you’re sharing your experience with the retailer.

[Cloverdale]

An appeal letter to a corp exec if you're not inclined to pursue civil action might be helpful?

https://www.mitsubishi-turbo.com/

[2011 335is lemans blue]

How many miles on your 335is?

[Mike K]

So sorry for your woes and thanks for the heads up!

I think Mitsu churns out garbage products. Years back, I remember a friend who had a Plymouth Laser. In about 12 months that car turned to dust. Ever see one around? You won't unless you're an archaeologist!

[Cloverdale]

Bimmerworld and Mitsubishi won't be getting my business going forward. Thanks for sharing.

[tlow98]

That sucks. Thanks for sharing and I’m sorry to hear it.