Air Filters Universal Fit for BMW & Audi | High Flow
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K&N Universal Clamp-On Air Filter 6in FLG / 7-1/2in B / 4-1/2in T / 9in H

$88.40
KNNRU-5046
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Filter 4 inch Flange 6 3/4 inch OD Base 5 7/8 inch OD Top 9 1/2 inch Height

$96.16
KNNRU-5045
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Filter Universal Clamp-On Filter-Round Tapered 2.75in Flange ID x 6in Base OD x 5in Top OD

$68.23
KNNRU-4960XD
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N XD air filters use a Deep Pile Design, Extra Fine Weave Grade Cotton and alternate geometries for added efficiency and capacity for off-road...

K&N Filter Universal Rubber Filter 2 1/2 inch Flange 6 inch Base 5 inch Top 5 1/2 inch Height

$68.23
KNNRU-4950
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Filter Universal Rubber Filter 2 3/4 inch Flange 6 inch Base 5 inch Top 6 1/2 inch Height

$68.23
KNNRU-4870
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Filter Universal Rubber Filter 2 1/2 inch Flange 6 inch Base 5 inch Top 6 1/2 inch Height

$68.23
KNNRU-4860
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Tapered Filter 3in Flange ID x 6in Base OD x 4in Top OD x 6.75in Height

$75.99
KNNRU-4700
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 4in FLG / 6in B / 4in T / 7in H

$75.99
KNNRU-4680
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Filter 6 inch Flange 7.5 inch Base 4.5 Top 4 inch Height

$68.23
KNNRU-4600
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Rubber Filter Round Tapered 4.625in Top OD x 5in Base OD x 4in H

$88.40
KNNRU-3700
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Air Filter (5in Flange / 6-1/2in Base / 4-3/8in Top OD / 8-3/4in Height)

$112.44
KNNRU-3107HBK
Air Filters Air Filters - Universal Fit Commerceinstruments Best Selling Products Instock K&N Engineering
K&N Black Universal Air Filters are made from Dryflow oil-free synthetic media. These low restriction clamp-on air filters are designed and manufactured for a...

K&N Universal Rubber Filter Round Tapered 6in Flange ID x 7.5in Base OD x 5.25in Top OD x 6.75in H

$88.40
KNNRU-3106HBK
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N Black Universal Air Filters are made from Dryflow oil-free synthetic media. These low restriction clamp-on air filters are designed and manufactured for a...

K&N Universal Rubber Filter Round Tapered 6in Flange ID x 7.5in Base OD x 5.25in Top OD x 6in Height

$79.87
KNNRU-3102HBK
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N Black Universal Air Filters are made from Dryflow oil-free synthetic media. These low restriction clamp-on air filters are designed and manufactured for a...

K&N Universal Rubber Filter Round Tapered 6in Flange ID x 7.5in Base OD x 5.25in Top OD x 8in Height

$79.87
KNNRU-3101HBK
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N Black Universal Air Filters are made from Dryflow oil-free synthetic media. These low restriction clamp-on air filters are designed and manufactured for a...

K&N Filter Universal Filter 2 3/8 inch Dual Flange 107mm C-C 3 inch Height

$75.99
KNNRU-2970
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Tapered Filter 6in Flange ID x 7.5in Base OD x 5in Top OD x 5in Height

$75.99
KNNRU-2960
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Filter Universal Filter 2 3/4 inch Dual Flange GSXR Oval (2/Box)

$128.73
KNNRU-2922
Air Filters Air Filters - Universal Fit Commerceinstruments Best Selling Products Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 5in FLG / 6-1/2in B / 4-3/8in T / 8-3/4in H

$88.40
KNNRU-2815
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Filter Universal Clamp-On Air Filter 5in Flange / 6-1/2in Base / 4-3/8in Top / 8in Height

$68.23
KNNRU-2805XD
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N XD air filters use a Deep Pile Design, Extra Fine Weave Grade Cotton and alternate geometries for added efficiency and capacity for off-road...

K&N Filter Universal Rubber Filter 5 inch Flange 6 1/2 inch Base 4 3/8 inch Top 7 inch Height

$68.23
KNNRU-2800
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Engineering K&N Filter Universal Rubber Filter - Round Straight - Angled Flange 81-82 ATC250R 250 FITS: Honda - KNNRU-1780

$63.58
KNNRU-1780
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 3-1/4in FLG / 5-3/4in B / 3-1/2in T / 5-7/16in H

$88.40
KNNRU-1637
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Tapered Filter 3.5in Flange ID x 5.5in Base OD x 4in Top OD x 8in Height

$75.99
KNNRU-1045
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 6in FLG / 7-1/2in B / 5in T / 8in H

$75.99
KNNRU-1044
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 6in FLG / 7-1/2in B / 5in T / 6-1/2in H

$75.99
KNNRU-1042
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 6in FLG / 7-1/2in B / 5in T / 7-1/2in H

$75.99
KNNRU-1041
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 5in FLG / 6-1/2in B / 5in T / 6-1/2in H

$75.99
KNNRU-1037
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Filter Universal Rubber Filter 3 1/2 inch 10 Degree Flange 5 3/4 inch OD 6 inch Height

$88.40
KNNRU-1035
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 4in FLG / 6-1/2in B / 4-1/2in T / 7in H

$75.99
KNNRU-1032
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 4in FLG / 6-1/2in B / 4-1/2in T / 8in H

$88.40
KNNRU-1027
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Tapered Filter 4-1/2in Flange, 6-1/4in x 9-1/4in Base, 7in x 4.5in Top, 10in Height

$88.40
KNNRU-1024
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Tapered Filter 6in Flange ID x 7.5in Base OD x 5in Top OD x 8in Height

$75.99
KNNRU-1020
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Tapered Filter 6in Flange ID x 7.5in Base OD x 5.875in Top OD x 6.5in Height

$75.99
KNNRU-1014
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Clamp-On Air Filter 6in FLG / 7-1/2in B / 5-1/8in T / 4in H

$75.99
KNNRU-1009
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Universal Rubber Filter 1 1/2in FLG 3in OD 4in Height

$55.07
KNNRU-0160
Air Filters Air Filters - Universal Fit Instock K&N Engineering
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other...

K&N Air Filter with Carbon Fiber Top and Base

$237.30
KNNRP-5135
Air Filters Air Filters - Universal Fit Commerceinstruments Best Selling Products Instock K&N Engineering
The RP-5135 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a K&N embossed carbon fiber top and carbon...
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High-Temperature Brake Fluid for BMW, Audi & European Cars

Brake fluid is the most overlooked consumable in a performance build. DOT 4 fluid from the factory absorbs moisture over time — lowering its boiling point until you get pedal fade under hard use. High-performance brake fluid maintains a consistent dry and wet boiling point, giving you a firm, repeatable pedal whether you're commuting or braking hard from 130 mph.

DOT Ratings and Boiling Points

  • DOT 4: 446°F dry / 311°F wet. Factory fill for most BMW and Audi. Replace every 2 years.
  • DOT 4 Racing (e.g. Motul RBF 600): 594°F dry / 420°F wet. Best upgrade for street/track cars. Same viscosity as DOT 4 — fully compatible, just flush and fill.
  • DOT 5.1: 500°F dry / 356°F wet. Higher spec than DOT 4, still glycol-based. Compatible with DOT 3/4 systems.
  • ⚠️ DOT 5 (silicone): NOT compatible with DOT 3/4/5.1. Do not mix. For specific applications only — not recommended for street or track use on BMW/Audi.

Recommended Brands

Motul RBF 600 · ATE Super Blue / Super Yellow · Castrol SRF · Brembo Racing brake fluid · Pentosin DOT 4. Most come in 500ml or 1L bottles — enough for a full flush.

Change Interval

Street use: every 2 years or 24,000 miles. Track use: every track day. Color-coded fluids (ATE Blue/Yellow) make it easy to confirm you've fully flushed the old fluid.

Related

Brake pads · Brake rotors · Stainless brake lines

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