Custom Headers & Exhaust Fabrication in Ames — Stainless TIG Work

Off-the-shelf headers exist for maybe a fifth of the engine swaps, restorations, and odd builds that actually happen in central Iowa garages — everyone else needs pipes bent and welded for their exact combination. Ames Hydraulics builds custom headers and does full custom exhaust fabrication in Ames: stainless TIG work for the builds that deserve it, mild steel for the budgets that don’t, and repair work on the cracked manifolds and headers already on the vehicle.

Why Stainless, Why TIG

Headers live in the worst thermal environment on a vehicle — glowing-hot cycles, vibration, and road salt. Mild steel headers rust from both sides and crack at the flange welds; 304 stainless, TIG-welded with full-penetration joints, survives all of it and looks the part doing it. Our custom headers are built from mandrel bends fitted to your chassis, back-purged where the weld shows and where flow matters, with thick flanges that don’t warp and collector merges that actually flow. It’s the same stainless discipline we apply to food-grade tanks, pointed at horsepower.

What We Build and Fix

• Custom header sets — engine swaps (LS into everything), street rods, tractors pullers, and restorations where nobody makes the part
• Full exhaust systems — turbo-back, header-back, dual conversions, and the tricky routing on lifted and lowered trucks
• Cracked header repair — flange re-welds, tube patches, and collector rebuilds cheaper than replacement
• Cast manifold repair — cracked iron manifolds welded with proper preheat (see cast iron welding) when the replacement is unobtainable
• Downpipes and turbo plumbing — v-bands, wastegate routing, and heat management
• Ag and industrial exhaust — tractors, gensets, and stationary engines that need a pipe nobody sells

How a Custom Build Works

Bring the vehicle (or the bare engine and chassis measurements for a build in progress). We talk goals — ground clearance, sound, plug access, budget — then mock up in the metal before final welding. Custom headers in stainless typically run $1,200–$3,000 a set depending on cylinder count and how tight the chassis is; mild steel builds run 30–40% less. Repair work on existing headers and manifolds is usually $100–$400. Full custom exhaust systems land $400–$1,500 by material and complexity. Every build is quoted in writing after we see the actual vehicle, because “it depends on the chassis” is the truest sentence in exhaust work.

The Odd Stuff Is Welcome

The builds that get turned away elsewhere are the ones we like: the diesel swap in a muscle car, the antique tractor with an extinct manifold, the generator that needs its exhaust routed through a wall, the pulling tractor with zenith pipes. If it burns fuel and needs pipe, text photos to 515-292-2599 and we’ll tell you what’s possible. 210 Freel Dr, Ames — Monday through Friday, 7AM to 5PM.

The Details That Separate Headers From Pipe

Anyone with a MIG welder can connect an exhaust port to a collector. What makes custom headers worth building is everything a casual job skips. Port-matched flanges, cut thick enough that they don’t potato-chip from heat cycles and machined flat so they seal without a fight. Primary tubes sized to the engine’s actual airflow — bigger is not better, and an over-tubed header kills the low-end torque a street engine lives on. Equal-length runners where the build justifies them, merge collectors that blend flow instead of crashing it into a box, and TIG welds back-purged so the inside of the tube is as clean as the outside — because a sugared, crusty internal weld is a flow obstruction you paid extra to install. Slip joints or flex sections where the engineering wants movement, V-band clamps where you’ll want serviceability, and bungs for O2 sensors and EGT probes placed where the readings mean something. That’s the difference you hear and feel.

Fitment: the Part You Can’t Order Online

The reason custom headers exist is that every swap is a packaging puzzle nobody else has solved. Steering shafts run exactly where the number three primary wants to go. Starters need heat clearance, plug wires need routing, and the chassis wants ground clearance the oil pan already spent. This is why we build on the actual vehicle — tubes mocked in the chassis, checked against suspension travel and engine rock, tacked and re-checked before final welding on the bench. It’s also why we ask about the whole plan up front: future turbo? A/C compressor coming later? Headers built around today’s engine bay only fit today. The vehicles that get this treatment are the ones that get driven — and the difference between headers that fit and headers that “fit” is the difference between a car you drive and a car you apologize for. Bring the project by 210 Freel Dr and we’ll look at the actual engine bay before quoting anything.

Not Just Cars: Headers for Whatever Burns Fuel

The custom headers bench doesn’t care what the engine sits in. Pulling tractors take stainless zoomies built to survive violence. Antique tractors and stationary engines need manifolds nobody has cast in seventy years — fabricated replacements solve what the swap meet can’t. Generators and irrigation engines need exhaust routed through walls and away from people, done to code with the right insulation standoffs. Boats need water-jacketed and marine-wrapped solutions. Even the odd industrial burner stack lands here. It’s all the same discipline — heat-cycled joints, vibration, and flow — applied wherever combustion needs plumbing. If the engine is unusual enough that nobody makes its exhaust, that’s not a problem; that’s the job description. Photos to 515-292-2599 get a straight answer on any of it.