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Carbon Cleaning / Walnut Blasting cost

Removing intake valve carbon on direct-injection engines. Real prices reported by owners on Reddit and BMW forums, with a link to every one.

Limited data: Two threads now, including one N55 price. Most prices are still N54.

Typical cost

BMW dealer

$600

Median $600 · 1 data point

Independent shop

$180 – $1,300

Median $438 · 8 data points

DIY (parts/tools)

$30 – $75

Median $53 · 2 data points

Ranges are the lowest and highest prices in the table below. They are not estimates. Shop prices include parts and labor unless noted.

Price	Where	Details	Source
$600	Dealer	Local BMW dealer price (Virginia, 2021)	[1]
$1,050	Indy	Reputable BMW shop quote, Virginia	[1]
$1,300	Indy	Another BMW shop quote, Virginia	[1]
$350	Indy	Paid at an indy (2020)	[1]
$425	Indy	Shop quote, Las Vegas; other shops $700+	[1]
$450	Indy	"About $450" in an expensive area	[1]
$400	Indy	Shop quote, Vienna VA area	[1]
$180	Indy	Local guy working out of his garage	[1]
$75	DIY	Harbor Freight blaster kit and walnut media, "under $75"	[1]
$475	Indy	Shop quote, 2014 F30 335i (N55), Raleigh NC (2019)	[2]
$30	DIY	Harbor Freight portable blaster ($30), if you already have a compressor	[2]

N55 owners report much less carbon than N54 at the same mileage, so many skip it on N55 (source 2).
Commenters say $300–$450 is a fair indy price; quotes above $1,000 suggest the shop does not want the job.

DIY: "a fairly decent weekend job" if you can pull the intake manifold (source 2).

Direct-injection BMWs: 135i/335i/535i (N54/N55), 328i (N20).

Walnut blasting kit / intake port adapter	ECS Tuning Pelican Parts Amazon
Walnut shell media 18-40 grit	ECS Tuning Pelican Parts Amazon
Intake manifold gaskets	ECS Tuning Pelican Parts Amazon