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Glasspack Mufflers | Straight-Through Design | HH Muffler

Glasspack Mufflers

The original performance muffler. Glasspacks use a straight-through perforated core wrapped in fiberglass packing for maximum flow and aggressive sound. If you want loud, this is it.

How Glasspacks Work

Sound waves pass through holes in the center tube and get absorbed by fiberglass packing. This provides some sound reduction while maintaining nearly unrestricted flow. The result is a loud, classic hot rod tone.

Popular Glasspacks

Cherry Bomb Glasspack - The original since 1968

Cherry Bomb M-80 - Compact glasspack for tight spaces

Xlerator Bullet - Maximum flow racing glasspack

Sound Level Warning

Glasspacks are LOUD - typically 95-100+ dB. They will create interior drone at highway speeds and may violate local noise ordinances. Best for weekend cars, shows, and rural areas.

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Frequently Asked Questions

How loud is a glasspack muffler compared to stock?

Glasspacks are significantly louder than stock mufflers - typically producing 95-105+ dB depending on engine size and exhaust configuration. They can be 2-3 times louder than factory exhaust. The straight-through design with minimal baffling allows most of the raw exhaust sound to pass through. They're among the loudest street mufflers available.

Are glasspack mufflers legal for street use?

Legality depends on your local noise ordinances. Many states have decibel limits (often 95 dB) that glasspacks may exceed, especially on larger engines. Some glasspacks are marked 'for off-road use only.' Check your local regulations before installing. Even where legal, glasspacks may attract unwanted attention from law enforcement due to their volume.

What's the difference between a Cherry Bomb glasspack and M-80?

The Cherry Bomb Glasspack is the original design with a longer case that provides slightly more sound absorption. The M-80 is a more compact version that fits tighter spaces but produces an even louder, more aggressive tone due to its shorter length. Both are straight-through designs - choose based on your available space and desired volume level.

Will glasspacks cause exhaust drone in my car?

Yes, glasspacks typically cause noticeable drone at highway cruising speeds because they do minimal sound frequency filtering. The drone can be fatiguing on long drives. If you want loud sound without excessive drone, consider a chambered muffler instead, or pair glasspacks with a resonator to help knock down the droning frequencies.

Do glasspacks add horsepower?

Glasspacks can add 5-15 horsepower depending on your engine and existing exhaust setup because they have virtually no internal restriction. They're among the most free-flowing mufflers available. However, on some engines, the complete lack of backpressure can slightly reduce low-end torque. The primary benefit is maximum exhaust flow and aggressive sound.