HKS 31021-AF026 Exhaust System LEGAMAX SPORTS for SUBARU WRX S4 (5BA-VBH) 2021-
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The quad exhaust for the WRX S4 is designed to reduce exhaust pressure while delivering an impressive sports sound that will leave you excited.
- By changing the pipe diameter from 74.7mm to 60.5mm x 2 to 45mm x 4, the straight structure achieves low exhaust pressure while reducing unpleasant exhaust note, thus improving both performance and sound quality.
- Symmetrically arranging the 4 silencers and the beautiful 98mm titanium tail creates a muffler that is not only powerful in the rear view but also visually appealing when the vehicle is lifted up.
- This exhaust system produces a pleasant bass sound at normal revs and a sporty sound when the accelerator is depressed.
Product specifications and sound quality
- By changing the pipe diameter from 74.7mm to 60.5mm x 2 to 45mm x 4, both low exhaust pressure and sound deadening effects are achieved.
- In addition to the pipe diameter, the expansion pipe, resonance pipe and muffler have been adjusted appropriately to bring out the boxer engine's character, emphasizing the unique low sound while creating the image of a sound quality with a dry high sound when the driver steps on the engine.
- When comparing this product with the stock muffler, approximately a 70% reduction in exhaust resistance was observed. This reduction is attributed to the pipe diameter, layout, and straight structure without apertures, which collectively achieve significantly lower exhaust pressure.