Exhaust Manifold

Exhaust Manifold: the first joint that decides how the whole system breathes

The exhaust manifold is the casting or fabricated tube set that bolts to the cylinder head and collects spent gas from every cylinder into one outlet, feeding it back toward the pipes, catalytic converters and muffler. On a factory setup it is usually a compact cast piece built for packaging and quiet running. People swap it because a manifold or header with smoother, longer runners scavenges better, and diesel owners in particular replace cracked or restrictive stock manifolds with stronger billet units. If you have ever pulled a leaking manifold gasket, you know this is the hot, high-torque joint everything downstream depends on.

What ThreePiece stocks

This category shows 43 products from 11 brands, with current prices from $97 to $3,645 for what is in stock right now (not a locked price). The range leans two ways: diesel billet manifolds and truck headers on one side, sport-compact and V8 headers on the other. BD Diesel carries the most listings here, followed by Kooks Headers, with Vibrant, HKS, Wehrli, Invidia, Magnaflow, Banks Power, BBK, Stainless Works and aFe filling out the shelf.

Concrete examples: the Wehrli L5P Duramax billet manifold kit with ARP hardware and the larger Wehrli Duramax manifold and stainless up-pipe kit cover the truck-diesel side. For gas engines, look at the HKS GR86 Super Manifold with catalyzer, the Kooks Camaro SS LT1 headers, the Stainless Works Silverado 5.3L catted headers, and the top-end Kooks Raptor R 5.2L header set.

How to choose

The split is real. A billet diesel manifold kit is about durability and sealing on a truck that cracks factory castings; those come with gaskets and hardware and sit in the mid to upper price range. A header set like the Kooks or Stainless Works pieces is about flow and often includes catted connection or Y-pipes, which is why they run to the top of the price spread. Smaller items near the $97 floor are the entry point. Decide first whether you need a bolt-in replacement or a flow upgrade, then match primary size and included pipework to your build.

Fitment and what else you need

35 of these listings carry fitment data, covering model years from 1988 to 2024 across Ford, Chevrolet, Dodge, Subaru, Ram, Jeep, Toyota, Cadillac and GMC. Common vehicles include the Ford F-150, Chevrolet Camaro, Subaru WRX, Jeep Wrangler, Toyota GR86 and Chevrolet Duramax trucks. Confirm your year and engine before ordering.

A manifold rarely goes on alone. Plan for exhaust flanges and exhaust pipes to tie into what follows, and if you are replacing catted sections check catalytic converters. Downstream, most buyers pair a header with a cat-back exhaust or a muffler. Browse the full Exhaust section to see how the pieces line up.

Not sure a part clears your engine bay? Call fitment help at 813-535-5801 or reach us through contact us. All orders ship free, and Affirm and Katapult financing is available.

Exhaust Manifold: the first joint that decides how the whole system breathes

The exhaust manifold is the casting or fabricated tube set that bolts to the cylinder head and collects spent gas from every cylinder into one outlet, feeding it back toward the pipes, catalytic converters and muffler. On a factory setup it is usually a compact cast piece built for packaging and quiet running. People swap it because a manifold or header with smoother, longer runners scavenges better, and diesel owners in particular replace cracked or restrictive stock manifolds with stronger billet units. If you have ever pulled a leaking manifold gasket, you know this is the hot, high-torque joint everything downstream depends on.

What ThreePiece stocks

This category shows 43 products from 11 brands, with current prices from $97 to $3,645 for what is in stock right now (not a locked price). The range leans two ways: diesel billet manifolds and truck headers on one side, sport-compact and V8 headers on the other. BD Diesel carries the most listings here, followed by Kooks Headers, with Vibrant, HKS, Wehrli, Invidia, Magnaflow, Banks Power, BBK, Stainless Works and aFe filling out the shelf.

Concrete examples: the Wehrli L5P Duramax billet manifold kit with ARP hardware and the larger Wehrli Duramax manifold and stainless up-pipe kit cover the truck-diesel side. For gas engines, look at the HKS GR86 Super Manifold with catalyzer, the Kooks Camaro SS LT1 headers, the Stainless Works Silverado 5.3L catted headers, and the top-end Kooks Raptor R 5.2L header set.

How to choose

The split is real. A billet diesel manifold kit is about durability and sealing on a truck that cracks factory castings; those come with gaskets and hardware and sit in the mid to upper price range. A header set like the Kooks or Stainless Works pieces is about flow and often includes catted connection or Y-pipes, which is why they run to the top of the price spread. Smaller items near the $97 floor are the entry point. Decide first whether you need a bolt-in replacement or a flow upgrade, then match primary size and included pipework to your build.

Fitment and what else you need

35 of these listings carry fitment data, covering model years from 1988 to 2024 across Ford, Chevrolet, Dodge, Subaru, Ram, Jeep, Toyota, Cadillac and GMC. Common vehicles include the Ford F-150, Chevrolet Camaro, Subaru WRX, Jeep Wrangler, Toyota GR86 and Chevrolet Duramax trucks. Confirm your year and engine before ordering.

A manifold rarely goes on alone. Plan for exhaust flanges and exhaust pipes to tie into what follows, and if you are replacing catted sections check catalytic converters. Downstream, most buyers pair a header with a cat-back exhaust or a muffler. Browse the full Exhaust section to see how the pieces line up.

Not sure a part clears your engine bay? Call fitment help at 813-535-5801 or reach us through contact us. All orders ship free, and Affirm and Katapult financing is available.