
Special engraved Akrapovic verification code on the muffler inlet cap.
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Measurements of the Akrapovic SLIP-ON SP SERIES system on the YAMAHA XT 660R (without noise damper):
Power: the utility and purpose of the Akrapovic SLIP-ON SP series is shown in the power curve, which is identical in shape to the stock curve. The system delivers an increase in power throughout the entire rpm range, following the same pattern as the stock set-up. The increase is nearly the same throughout the range, with a slightly higher increase near the top and in the overrev range. At 6000 rpm the system delivers over 44 HP.
Torque: the torque is also increased throughout the range, and also follows the stock curve. The maximum difference appears in the middle of the range, which is right where you need it for everyday riding.

|
Stock | Akrapovic | Max. increased power | ||
| Max. rear wheel power (HP / rpm) | 42.8 / 5950 | 44.1 / 6000 | 2.1 / 6500 |
| SS-Y6SO5-HDT | Slip-On Line Titanium (SP Series) |
Download pdf documents for more details on this product.