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SuperTrapp 4" Diffuser Disc Only for 2.5" Pipe

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Brand: SuperTrapp Industries

The patented radial diffuser design of SuperTrapp mufflers allow you to tune your exhaust by adding or removing diffuser discs. Each disc provides a new escape route for exhaust gas (and noise). Adding more discs lowers back pressure while increasing noise. Fewer discs decreases noise while increasing back pressure. You can gain a measureable performance advantage by wave tuning your engine and carburetion to produce the best power band for any track. In certain racing classes where carb tuning is restricted, SuperTrapp diffusers have become standard equipment.

The Diffuser Disc Only series gives you the tunability of the diffuser discs without the weight and bulk of a glasspack muffler. They are ideal for use after an inline muffler, but they can also be used on a straight-through system. The 4" diffuser is recommended for engines up to 250 HP or a 4.0L engine. Use a diffuser on each pipe of a dual-exit exhaust for engines up to 500 HP.

This kit includes a steel weld-on flange, 12 diffuser discs, a polished end cap, and 6 disc bolts and nuts. Simply weld the flange to your 2.5" OD exhaust pipe and then bolt the discs and end cap to the flange. Experiment with different numbers of diffuser discs until you find the right balance of power, torque, and sound levels.

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Condition: New

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SuperTrapp Diffuser Only Series

Supertrapp 4inch Diffuser Disc Only for 2.5 inch pipe


Silences the short run exhaust to well below 90db and allows further tuning of the engine. have short run exhaust system of glass pack mufflers and placing the diffuser disk pack at the end allows normal conversation inside; can now hear the engine sound for possible trouble sounds

Steve Hurt

California, Oregon, Arizona


Fits well - helps reduce sound with race muffler


Only issue was that the supplied lock nuts were incorrect. I had correct ones in shop.


Charleston SC




The nuts on the 6 long bolts are the wrong threads! True in 2 shipments. I got the right ones at a local hardware store. Otherwise it did its job.

heavy D

Durham Ct


SuperTrapp 4" Diffuser Disc Only for 2.5" Pipe

4.7 3