Restoring American Muscle Car and Classics - we help your engine breath easier!



This item is out of stock



OEM style 1973-79 Pontiac Trans Am W72 L78 400 / 455 Fresh Air Duct. This is the correct style 4" fresh air duct that was used on all Pontiac Trans Ams/Formulas from 1973-1979. It is new and has never been used. Each hose features a 4" diameter opening on both ends with formed plastic clips. Unlike the cheaper flex hose with no clips, these are as close to the OEM air intake hoses as possible. The 4" vinyl hose covers the spiral wrapped insert - providing resistance to moisture, as well as the strength required to bridge the gap between the air cleaner inlet and fender mounted fresh air duct. It will install on your W72 oval to round intake adapter, as well as on the L78/L80 round snorkel end; the connection point is at the elbow duct near the fender.

Specifications: These hoses are approximately 8" in the relaxed position and extend up to 18" to fit a myriad of requirements. Since they feature metal spirals, they will retain their uniform diameter throughout the hose once installed. Note the original 73-76 parts were made of fiber material and broke down over time; later versions were updated to vinyl for durability and retained a metal clasp. The GM replacement part PN 489908 featured these specific style clips. The modern iterations have small steel rivets holding the ends in, while these original pieces feature the correct factory staples.

These parts have completely disappeared from the production process - we have a very limited number of these available. The last picture shows how it will look once installed (76 T/A 400 pictured as a reference only).

Note that several current aftermarket parts feature the spiral vinyl hose - there are no ends on them and they look the part of a cheap replacement.  

For further information on the restoration process, please contact us.




This assembly is correct for the following models:

Pontiac 1973-79

Trans Am with 400 / 455 Pontiac engine; 301 & Turbo Trans Ams with the 2.5" x 6" oval snorkel inlet with adapter and large 4" fender elbow duct; 403 Oldsmobile L78

Trans Am / Firebird / Formula 



The assembly will fit factory 4 barrel air cleaner assemblies as found on the 73-79 Trans Ams models featuring 4" fresh air  inlets. Return requests for non-fitment will not be honored.





The assembly will ship within one day (usually the day of payment) with shipping/tracking information provided.



This assembly is guaranteed to match the item description – customers have up to 14 days to return the assembly after receipt if it is not as described.



Assemblies must be returned in the original packing – customers are responsible for return shipping charges. A refund will be issued upon receipt of the inspected assembly. Returns for non-fitment will not be honored – please ask questions first.



In the event of shipping damage, customers must save all packaging and send 5 digital pictures so Musclecar Air Cleaners can initiate a shipping damage claim.



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