Yoshimura R&D of America, Inc.

NINJA 650 12-16 Race RS-4S Stainless Full Exhaust, w/ Stainless Muffler

NINJA 650 12-16 Race RS-4S Stainless Full Exhaust, w/ Stainless Muffler - Main image
$593.34 $899 In stock

Category: Race Series Exhaust System

A unique design that provides an unrivaled combination of power and a quiet exhaust note. The RS-4S features a Polyresonant duplex chamber, a two-staged stepped baffle, and an innovative carbon fiber turn-out end-cap.

  • Pentagonal-shaped sleeve
  • Front muffler cap functions as a polyresonant chamber which helps reduce noise
  • Two-stage stepped baffle
  • Turn-out carbon fiber end-cap
  • Stainless steel tail-pipe

Sound Insert/Spark Arrester Options

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Sound Level

Volume Insert Spark Arrestor Included
SA-13-K-1 No
RS4S-INS-1 Yes

INS-18-K

No 
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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Michael A. ★★★★★

The duplex chamber really tames the sound without killing the power—my Ninja feels stronger through the midrange and actually sounds better than I expected. Installation was straightforward too, once I figured out the stepped baffle alignment.

Richard ★★★★★

I was a little worried the carbon fiber muffler would be too loud, but the stepped baffle keeps it mellow while still adding noticeable mid-range pull on the Ninja.

Hannah L. ★★★★★

That two-staged stepped baffle makes a huge difference—it's got that deep growl without waking the whole block. The stainless muffler looks sharp against the black frame, and the power delivery feels noticeably smoother through the mid-range.