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S&s gnx 4.5 on TC

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Old May 8, 2026 | 09:33 AM
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Default S&s gnx 4.5 on TC

10 ultra stage 2
considering changing out my MGS custom mufflers for a set of GNX 4.5. Already have S&s powertune headers.
looking for opinions from those running these also bike is tuned based on current ad ons. Can these added with the tune as is?
 
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Old May 11, 2026 | 10:46 AM
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I'm running the GNX on an M8, you'll probably be ok without additional tuning.
 
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Old May 11, 2026 | 02:53 PM
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Originally Posted by ThePaintPirate
I'm running the GNX on an M8, you'll probably be ok without additional tuning.
Thanks for the reply. Spoke to my tuner and said it depends on baffle size between the two. If similar then likely tune will be fine.
 
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Old Today | 07:57 AM
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Originally Posted by ThePaintPirate
I'm running the GNX on an M8, you'll probably be ok without additional tuning.
Do you use the db reducer? How does it affect performance, torque and exhaust note.
 
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