Hyper Sonic Inox Exhausts

The GPR Hyper Sonic Inox is a polygonal-body stainless steel exhaust made in Italy by GPR Exhaust Systems. GPR cuts each Hyper Sonic Inox for a specific bike and year range, so the brackets and mounts meet your stock hardware without modification. The range covers Road, Trail and Off-Road machines. Most fitments include a removable db killer. Every order ships free worldwide and carries a 2-year GPR manufacturer warranty.

✔ Authorized GPR Dealer | ✔ Made in Italy | ✔ 2-Year Manufacturer Warranty | ✔ Free Worldwide Shipping | ✔ Model-Specific Fitment

Shop GPR Hyper Sonic Inox exhausts by motorcycle make

Pick your make to see the GPR Hyper Sonic Inox fitments we build for it, then filter by model and year.

BMW KTM Aprilia Yamaha

GPR Hyper Sonic Inox specs

Attribute	Value
Silencer Shape	Polygonal
End Cap Finish	Brushed Stainless steel
Material	Stainless Steel
Manufactured In	Italy
Removable db Killer	Included on most fitments
System Types	Slip-On, Dual Slip-On, Full System (Race)
Vehicle Types	Road, Trail and Off-Road
Model Years Covered	1980 to present
Warranty	2-year GPR manufacturer warranty

Is the GPR Hyper Sonic Inox street legal?

It depends on the exact fitment. GPR splits this range into emissions groups, and we record the status on every product page. Check the product you want before you buy.

Emissions Status	What It Means for You
Meets EPA emissions limit	Legal for street use in the US on a registered bike.
Not EPA or CARB certified	Sold for closed-course competition use only.

Read this before you order. A large share of these fitments are race-use parts rather than street parts. Some also delete the catalytic converter and may need an ECU adjustment to run correctly. Send us your year, make, and model and we will tell you which group your bike falls into.

Which GPR Hyper Sonic Inox system should you buy?

Each system type replaces a different amount of your stock exhaust.

System Type	Replaces	Best For
Slip-On	Stock silencer only	A 20 to 30 minute bolt-on that changes the look and the tone
Dual Slip-On	Both stock silencers	Twin-exit bikes where a matched pair keeps the factory symmetry
Full System (Race)	Everything, catalytic converter deleted	Track and closed-course use only

Compare the Hyper Sonic Inox with the rest of the Hyper family

The Hyper name covers several finishes. These are the closest alternatives.

GPR Line	Silencer Shape	End Cap Finish
Hyper Sonic Black Titanium	Polygonal	Matte Black
Hyper Sonic Titanium	Polygonal	Matte Black

Frequently asked questions about GPR Hyper Sonic Inox exhausts

What is the GPR Hyper Sonic Inox exhaust?

The GPR Hyper Sonic Inox is a polygonal-body stainless steel performance exhaust made by GPR Exhaust Systems in Italy. GPR cuts each one for a specific bike and year range. It comes in Slip-On, Dual Slip-On, Full System (Race) form.

How loud is the GPR Hyper Sonic Inox?

The GPR Hyper Sonic Inox runs louder than your stock exhaust and deeper in tone. Most fitments ship with a removable db killer, so you can drop the volume for street riding and pull it out for track days. GPR does not publish one dB figure for the line, because the number moves with the bike and the system type. Ask us about your model and we will tell you what we have on that fitment.

Will a GPR Hyper Sonic Inox fit my bike?

GPR builds the Hyper Sonic Inox for one bike and one year range at a time. Pick your make from the pills above, then filter by model and year. If your model is not listed, contact us before you rule it out. GPR adds fitments through the year, and we can check the Italian factory catalog directly.

Do I need an ECU remap or a tune?

Slip-on Hyper Sonic Inox systems run on the stock ECU map on most bikes. Full systems that delete the catalytic converter often need a fueling adjustment to run right and protect the engine. GPR flags this on the affected products. Tell us your model and we will say which group yours falls into.

What warranty comes with a GPR Hyper Sonic Inox?

Every GPR exhaust carries a 2-year manufacturer warranty against defects. GPR Exhausts Direct is an authorized GPR dealer, and our team files the claim with the Italian factory for you.

Can I run luggage on a bike with a GPR Hyper Sonic Inox?

Yes, on most models. GPR builds its GPR Tech side cases and top cases in the same factory as the exhausts, so the mounting hardware clears GPR silencers on shared fitments. Check that your model appears in both collections, or send us your year, make, and model and we will confirm the clearance.