Speed Series vs Street Series Exhaust: What Changed for 2026
By Yoshimura R&D of America, Inc. | Published: 2026-10-18
Category: Comparisons
Compare Yoshimura Speed Series and Street Series exhausts for 2026. Learn the key trade-offs in power, weight, and fitment for your bike.
Quick answer
For 2026, Yoshimura's Speed Series delivers race-bred power and weight savings for sport riders, while the Street Series remains the go-to for daily commuters who want a balanced upgrade without sacrificing low-end torque or noise compliance.
Performance focus: Speed Series is built for the track
The Speed Series line, including the AT2 systems for the Suzuki GSX-8S and Yamaha R9, is engineered for maximum horsepower and torque gains. Yoshimura's catalog notes that the AT2 system for the R9 provides 'more horsepower and torque throughout' the rev range. This is achieved through optimized header design and the AT2 muffler profile, which prioritizes flow over noise reduction.
If you're chasing lap times or canyon carving, the Speed Series is the clear choice. The trade-off is that these systems are louder than their Street Series counterparts and may not be legal for street use in all areas.
Weight savings: Speed Series sheds pounds
Weight reduction is a hallmark of the Speed Series. The AT2 system for the Yamaha R9 removes 4.5 lbs compared to the stock exhaust. For the CFMOTO 675SS, the AT2 system is described as a 'true power upgrade' that also cuts weight.
The Street Series typically retains more mass due to its larger, more heavily baffled muffler. If you're a weight-weenie or a racer, the Speed Series is the lighter option. For street riders, the extra weight of the Street Series is rarely noticeable in daily use.
Fitment and compatibility: Speed Series covers newer models
For 2026, Yoshimura has expanded the Speed Series to cover popular new platforms like the Suzuki GSX-8S/R/T/TT (2023-2026), Yamaha R9 (2025-2026), CFMOTO 675SS (2025-2026), and the Honda Grom (2022-2026) with the RS-9T high mount.
The Street Series covers a broader range of older models but may not include the newest bikes. If you ride a 2025+ model, the Speed Series is likely your only Yoshimura full system option. For older bikes, the Street Series offers a proven, more affordable upgrade path.
Speed Series vs Street Series: Key Trade-offs
- Power gains: Speed Series delivers more peak horsepower and torque, especially at high RPMs. Street Series focuses on a broader, more linear power curve that's easier to manage in traffic.
- Weight: Speed Series systems are significantly lighter (e.g., 4.5 lbs saved on the R9). Street Series is heavier due to a larger muffler and more sound-deadening material.
- Noise level: Speed Series is louder and more aggressive. Street Series is quieter, often with a removable baffle for some adjustment. Check local noise ordinances before choosing Speed Series for street use.
- Price: Speed Series systems are premium-priced (e.g., $767 for the GSX-8S, $923 for the R9). Street Series is generally more affordable, though exact pricing varies by model. If budget is a primary concern, the Street Series offers excellent value without sacrificing quality.
- Model coverage: Speed Series covers the newest models (2023+ GSX-8S, 2025+ R9, 2025+ 675SS, 2022+ Grom). Street Series covers a wider range of older bikes and is often the only option for pre-2020 models.
Product facts
- GSX-8S/R/T/TT 23-26 AT2 Stainless Full Exhaust, w/ Stainless Muffler: The AT2 Speed Series system for the GSX-8S is a 49-state legal full system with a carbon fiber heel guard. It's a direct power upgrade for the Suzuki 800 twin that keeps the bike street-legal in most states, making it a practical choice for daily riders who also want track-level performance.
GSX-8S/R/T/TT 23-26 AT2 Stainless Full Exhaust, w/ Stainless Muffler - R9 25-26 AT2 Stainless Full Exhaust, w/ Stainless Muffler: The AT2 system for the Yamaha R9 removes 4.5 lbs and provides more horsepower and torque throughout the rev range. For R9 owners, this means a noticeable improvement in acceleration and handling, especially when combined with the bike's already sporty chassis.
R9 25-26 AT2 Stainless Full Exhaust, w/ Stainless Muffler
Which exhaust should you choose?
Best for
- Track riders and canyon carvers who want maximum power and minimum weight
- Owners of 2023+ Suzuki GSX-8S, 2025+ Yamaha R9, 2025+ CFMOTO 675SS, or 2022+ Honda Grom seeking a direct performance upgrade
Not for
- Daily commuters who prioritize a quiet, low-maintenance exhaust
- Riders on a tight budget who don't need the absolute peak performance
