Exhaust Installation Kits

Exhaust Installation Kits: the hardware that makes the new exhaust actually bolt up

When you buy a new muffler, header or cat-back, the pipe is only half the job. Exhaust installation kits are the fitting hardware - the flanges, gaskets, mounts and adapters - that let the system seal and hang the way it should. Fit one and you avoid the classic mistakes: a header that leaks at the flange, a cat-back that rings against the chassis, or a joint you have to keep re-torquing because you reused a crushed gasket. It is the difference between a clean install and a rattle you chase for a month.

These kits are vehicle- and system-specific. A fitting kit made for one platform carries the correct brackets, clamps and gaskets for that exhaust; a generic header kit gives you a flange and donut gasket sized to the pipe outlet. Buy the one that matches what you are installing.

What ThreePiece stocks in this category

Right now there are 3 products in this category from 2 brands - Akrapovic and Vibrant - with current prices running from $65 to $625. That spread reflects two very different buyers. At the top, the Akrapovic 2024+ Porsche Panamera Fitting Kit (P-MF1051) is dedicated hardware for a specific Akrapovic system. At the entry point, the Vibrant J-Spec Header Installation Kit is a flange-and-donut-gasket set for headers with a 2.5in OD outlet. In between sits the Akrapovic 2019+ Mercedes-Benz G500/G550 (W463A) Fitting Kit. Prices are the current range for what is in stock, not a standing promise.

How to choose

The main decision is system-matched versus universal. Two of the kits here have specific fitment data covering Mercedes-Benz and Porsche - the Porsche Panamera, Mercedes-Benz G500 and G550 across the 2019 to 2024 model years. If you are running an Akrapovic system on one of those, buy the fitting kit built for it: the brackets and gaskets are cut for that exhaust and you won't be fabricating anything.

  • If you're installing a header and just need to seal the outlet, the Vibrant J-Spec kit is the budget-friendly, flange-based route - confirm your outlet OD matches.
  • If you bought a brand-specific system, get the matching brand fitting kit rather than a universal gasket set.

What else you need with it

An installation kit finishes an exhaust job - it doesn't replace the pipework. Pair it with the system it serves: a cat-back exhaust, an axle-back system, or standalone mufflers. If you're building from sections, browse exhaust pipes and exhaust flanges to match your joints, and exhaust tips to finish the tailpipe. You can see the full lineup on the Exhaust section.

Fitment help and ordering

Because these kits are tied to specific systems and vehicles, check the fitment before you order. If you're unsure which kit matches your exhaust, call fitment help at 813-535-5801 or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout.

Exhaust Installation Kits: the hardware that makes the new exhaust actually bolt up

When you buy a new muffler, header or cat-back, the pipe is only half the job. Exhaust installation kits are the fitting hardware - the flanges, gaskets, mounts and adapters - that let the system seal and hang the way it should. Fit one and you avoid the classic mistakes: a header that leaks at the flange, a cat-back that rings against the chassis, or a joint you have to keep re-torquing because you reused a crushed gasket. It is the difference between a clean install and a rattle you chase for a month.

These kits are vehicle- and system-specific. A fitting kit made for one platform carries the correct brackets, clamps and gaskets for that exhaust; a generic header kit gives you a flange and donut gasket sized to the pipe outlet. Buy the one that matches what you are installing.

What ThreePiece stocks in this category

Right now there are 3 products in this category from 2 brands - Akrapovic and Vibrant - with current prices running from $65 to $625. That spread reflects two very different buyers. At the top, the Akrapovic 2024+ Porsche Panamera Fitting Kit (P-MF1051) is dedicated hardware for a specific Akrapovic system. At the entry point, the Vibrant J-Spec Header Installation Kit is a flange-and-donut-gasket set for headers with a 2.5in OD outlet. In between sits the Akrapovic 2019+ Mercedes-Benz G500/G550 (W463A) Fitting Kit. Prices are the current range for what is in stock, not a standing promise.

How to choose

The main decision is system-matched versus universal. Two of the kits here have specific fitment data covering Mercedes-Benz and Porsche - the Porsche Panamera, Mercedes-Benz G500 and G550 across the 2019 to 2024 model years. If you are running an Akrapovic system on one of those, buy the fitting kit built for it: the brackets and gaskets are cut for that exhaust and you won't be fabricating anything.

  • If you're installing a header and just need to seal the outlet, the Vibrant J-Spec kit is the budget-friendly, flange-based route - confirm your outlet OD matches.
  • If you bought a brand-specific system, get the matching brand fitting kit rather than a universal gasket set.

What else you need with it

An installation kit finishes an exhaust job - it doesn't replace the pipework. Pair it with the system it serves: a cat-back exhaust, an axle-back system, or standalone mufflers. If you're building from sections, browse exhaust pipes and exhaust flanges to match your joints, and exhaust tips to finish the tailpipe. You can see the full lineup on the Exhaust section.

Fitment help and ordering

Because these kits are tied to specific systems and vehicles, check the fitment before you order. If you're unsure which kit matches your exhaust, call fitment help at 813-535-5801 or reach us through contact us. Every order ships with free shipping, and Affirm and Katapult financing is available at checkout.