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Description
Holley 120-521 RetroFilter Drive-By-Wire Air Cleaner - 14-Inch Diameter - Dual Snorkel - BlackFits LS3 Style DBW Throttle Body Cotton Gauze Element Part Number: 120 521 RetroFilter air cleaners cleverly hide an LS drive by wire throttle body inside to maintain a low height and classic looks. Utilizing a hidden opening in the base to hide unsightly wiring from the throttle body, this trick air cleaner allows you to experience all the benefits of modern technology and keep the vintage look you want. Pair with any Holley intake manifold with a
Fits LS3-Style DBW Throttle Body - Cotton Gauze ElementPart Number: 120-521
RetroFilter air cleaners cleverly hide an LS drive-by-wire throttle body inside to maintain a low height and classic looks. Utilizing a hidden opening in the base to hide unsightly wiring from the throttle body, this trick air cleaner allows you to experience all the benefits of modern technology and keep the vintage look you want. Pair with any Holley intake manifold with a 4150/4160 square bore flange for maximum aesthetics and performance. The opening is 92mm but any 4-bolt pattern LS throttle body will physically fit. We recommend the LS2/LS3/LS7 style but the L33, L76, and L92 should also fit. *Requires adapter to connect to 4150/4160 square bore flange style manifold - Holley EFI part # 17-93 is recommended. All part numbers in this series: 120-500 - 16-Inch DBW Air Cleaner - Chrome 120-501 - 16-Inch DBW Air Cleaner - Black 120-520 - 14-Inch Dual Snorkel DBW Air Cleaner - Chrome 120-521 - 14-Inch Dual Snorkel DBW Air Cleaner - Black
Features and Benefits
• Allows full EFI functionality stealthily hidden within a traditional looking air cleaner package
• Each kit includes a 3-inch tall, pre-oiled, washable and reusable premium cotton gauze filter element
• Available in Black and Chrome finishes
• Adapts to LS style drive-by-wire throttle bodies found on the LS2, LS3, LS7, etc.
• Can be installed on any vehicle running a top mounted 4150/4BBL EFI capable intake manifold with LS3 DBW wiring components
• Stamped aluminum lid and base for optimal durability and light weight
While some Gen V LT DBW throttle bodies may share the same bolt pattern, they will not fit properly.
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Exchange/Return Notes
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4.4 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
Considering it's used: GREAT!
Format: Hardcover
It was used but in great condition considering. It had a bit of minimal wear on the front cover but the pages were totally fine. The seller was honest in the listing. Also, got the package safe and in reasonable time. Good product. Totally worth it if you are looking for a good book for cheap and still in good condition.
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Reviewed in the United States on June 29, 2021
★★★★★ 5
Very detailed
Format: Hardcover
Nicely illustrated, with a tremendous amount of information about the characters, weapons, vehicles, armor, locations, allies, and enemies. A must read for anyone who plays the game.
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Reviewed in the United States on October 26, 2013
★★★★★ 5
Pretty Darn Good
Format: Hardcover
ok, so this book s really really good and i think so for many reasons. but i do think there is stuff wrong with it too. just a couple minor complaints though... truly this is probably the best halo book out there, so if youre a fan, hell with minor complaints GET IT!!!!!! and the price is only 14 dollars so i would say get the book.
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Reviewed in the United States on September 28, 2013
★★★★★ 5
Amazing
Format: Hardcover
Outstanding atrwork
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Reviewed in the United States on March 26, 2026
★★★★★ 5
Gorgeous book!
Format: Hardcover
Beautifully illustrated book. I got this for my son who's into this set of characters. It's a hard bound book,bright colors. He was super happy with it. I think it's worth the price as its a nice gift. If you or someone in your life likes these characters,they will love it as much as he does.
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Reviewed in the United States on February 9, 2026