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BFI MK3 1.8T Swap Fueling Upgrade (Stage 2 - K04/FT21)
BFI MK3 1.8T Swap Fueling Upgrade (Stage 2 - K04/FT21)
BFI MK3 1.8T Swap Fueling Upgrade (Stage 2 - K04/FT21)
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BFI MK3 1.8T Swap Fueling Upgrade (Stage 2 - K04/FT21)

Marsoni M251S
Sale price$300.00
Pay 4 payments of $75.00 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
BFI MK3 1.8T Swap Fueling Upgrade (Stage 2 - K04/FT21)This kit includes everything necessary to upgrade your existing Black Forest Industries MK3 1. 8t Turbo Kit from a K03 turbo to the K04 F21 kit. Included are 4 upgraded Audi TT 225 Injectors as well as a specific chip for management, custom made by C2 Motorsports.
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Quick Dispatch:

Your BFI MK3 1.8T Swap Fueling Upgrade (Stage 2 - K04/FT21) orders ship within 1-2 business days.

Delivery Options:

  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your BFI MK3 1.8T Swap Fueling Upgrade (Stage 2 - K04/FT21) ships.

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 1731 reviews
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Product Reviews
G
Verified Purchase
Gram21
West Palm Beach, US
★★★★★ 5
Well built, good fit.
I like it so well, I just bought two more to keep on the shelf for when the price doubles. Seems better built than oem, but I don't know how you can judge the filtration; seems good though.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
L
Verified Purchase
LJ
San Leandro, US
★★★★★ 5
Great product
Perfect fit for 21 Cross Trek
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 12, 2026
C
Verified Purchase
catspurr
Battle Creek, US
★★★★★ 5
Good Product
Size: (Pack of 1)
Came with all necessary supplies. Seemed to be of good quality and my taco is running well after the oil change. Will buy again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
B
Verified Purchase
BBOWL
Bozeman, US
★★★★★ 5
Works Fine, Fits Fine
Size: (Pack of 1)
Seem to work and fit just fine and should be better than a cheap paper filter. They cost more but I change the oil on the 5's and the filter on the 10's so it evens out. Not going more than 10K on the filter. If you are only going to use the filter for 5K miles I would stick with the Toyota factory filter. I use the K&N filters on a 2017 Toyota Sienna and a 2018 Toyota Highlander. Both are V6
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 23, 2025
D
Verified Purchase
David Benjamin
Lexington, US
★★★★★ 5
Filter
Size: (Pack of 1)
Great product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 25, 2026

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