H.A.R.M. Mufflers - Herfurth Aluminum Racing Mufflers

Exhaust Builder Kits

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Custom Exhaust Builder Kits

We have data on most common/popular vehicles and combinations, but if we don’t have yours, we’ll need a picture or drawing and we can likely put together a builder kit for you!

Real Assembly Required

We don't do “bolt on” or “off-road” exhaust systems: ALL of our systems are BUILDER KITS that require final fitting, cutting, and welding!

Complete Install Kits

H.A.R.M.'s builder kits provide you with everything you need, not a bunch of pieces that you don’t, and each kit is targeted toward your specific vehicle.

While our custom exhaust builder kits are most commonly dumped right in front of the rear axle, we also offer tailpipe builder kits!

Builder kits available in 2.5”, 3”, 3.5”, and 4”

We use heavy-wall tube at the headers up to and including the X or merge, or for the first few feet of a divorced pipe system. On certain N/A racecars, we do a lightweight kit with thinner wall tubing. Contact us for custom pricing and to discuss if we think it will work in your application!

Pricing

Pricing varies as a small car uses less tubing than a pickup truck or larger car.

Ex: Our standard 3” exhaust X pipe builder fits a lot of cars, including G-Body, Mustang, Camaro, and more.

Shorter systems with fewer decreases the price.

Conversely, adding system length, more turns or bends, etc. all increase costs.

Larger diameter tubing or thicker wall material also increases price.

HARM Mufflers exhaust builder kit for Ford Mustang Cobra SVT
Exhaust Components

Individul components, including HARM blocks, H-pipes, X-pipes, Y-pipes/merge collectors, transitions, V-band assemblies, and more, are also available individually.

H.A.R.M. Mufflers‘ lightweight aluminum and titanium mufflers and exhaust system components are precision-made, here in the USA! Race cars running H.A.R.M. mufflers and exhaust components have shattered multiple class records.

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