Benelli TNT125 TNT135 Tornado +TNT Naked De-Cat Down-Pipe Exhaust header and Rear Silencer, UK Made

If you’re looking to upgrade your machine with a premium benelli tnt125 exhaust system that delivers genuine performance gains, weight savings, and exceptional build quality, you’ve come to the right place. The Benelli TNT125 TNT135 Tornado +TNT Naked De-Cat Down-Pipe Exhaust Header and Rear Silencer from Quill Performance Exhausts represents the pinnacle of UK manufacturing excellence, designed specifically for riders who demand more from their lightweight sportsbike without compromising reliability or requiring complex fueling modifications.

About the Benelli TNT125 Exhaust System

This complete benelli tnt125 exhaust upgrade consists of a British-made T304 stainless steel front pipe/header paired with your choice of rear silencer. Each component has been precision-engineered to fit exactly like the standard system, but with significant improvements in both weight and exhaust gas flow characteristics. By removing the restrictive standard catalytic converter box, this de-cat system allows your Benelli TNT125 or TNT135 to breathe more freely, unlocking additional horsepower and torque that the factory setup simply cannot deliver.

The header pipe is manufactured from high-grade T304 stainless steel, a material chosen for its superior corrosion resistance, heat tolerance, and longevity. Unlike mild steel alternatives that rust and degrade over time, this premium stainless construction ensures your investment will look and perform brilliantly for years to come. The system comes complete with an O2 Lambda sensor boss, allowing you to refit your standard OEM sensor without any modifications, and includes a free removable DB killer (baffle) so you can tailor the exhaust note to your preference or local noise regulations.

Key Features of the Benelli TNT125 Exhaust Upgrade

One of the most compelling aspects of this benelli tnt125 exhaust system is the dramatic weight reduction it offers. The standard factory downpipe weighs a hefty 3.4 kilograms, whilst our replacement downpipe tips the scales at just 1.1 kilograms—an impressive weight saving of 2.3 kilograms. For a lightweight 125cc machine, removing over two kilos from the exhaust system makes a noticeable difference to handling, acceleration, and overall agility.

• T304 Stainless Steel Construction: Premium grade material offering exceptional durability and corrosion resistance
• De-Cat Design: Removes restrictive catalytic converter to improve exhaust gas flow and power output
• Direct Fit: Engineered to fit exactly like the standard system with no modifications required
• O2 Sensor Boss Included: Allows refitting of your standard OEM Lambda sensor
• Removable DB Killer: Free baffle included for sound level adjustment
• Significant Weight Saving: 2.3kg lighter than the factory system
• Choice of Rear Silencers: Multiple options available to suit your style and requirements
• UK Manufactured: Proudly made in Britain to exacting quality standards

The downpipe fits directly to the standard rear silencer without requiring a gasket. For optimal results, Quill Performance Exhausts recommends using a normal silicone-based sealant instead of the factory gasket to create a perfect gas-tight seal. This modern sealing approach offers superior durability and easier future maintenance compared to traditional gasket materials.

If you’re looking to upgrade your entire exhaust system, you might also consider the Benelli TNT125 TNT135 Tornado +TNT Naked Rear Silencer, UK Made for a complete front-to-back performance upgrade.

Why Choose This Benelli TNT125 Exhaust Over Competitors?

Quill Performance Exhausts has built a reputation for creating exhaust systems that deliver real-world performance gains without the complications often associated with aftermarket modifications. This benelli tnt125 exhaust system has been specifically designed and tuned to give maximum power without requiring alterations to the standard fueling or ECU mapping. For most riders running a standard air filter, this system will work perfectly straight out of the box.

However, if you’ve already fitted an aftermarket air filter or are running this de-cat system, having your bike’s fueling professionally assessed and optimised will always complement the engine’s performance and efficiency. A proper fuel map adjustment ensures you’re extracting every available bit of power whilst maintaining optimal air-fuel ratios for reliability and throttle response. For guidance on motorcycle tuning and exhaust modifications, the Motorcycle.com exhaust systems guide provides excellent technical information about how exhaust modifications affect performance.

Installation and Compatibility

This complete exhaust system is designed specifically for the Benelli TNT125, TNT135 Tornado, and TNT Naked models. The precision fitment means installation is straightforward for anyone with basic mechanical skills and tools. The system bolts directly in place of your standard exhaust components, maintaining all original mounting points and clearances.

Whether you’re fitting it yourself in your home garage or having your local mechanic install it, the process is refreshingly simple compared to universal-fit alternatives that require cutting, welding, or fabrication.

The included O2 sensor boss ensures your bike’s fuel injection system continues to receive proper feedback from the Lambda sensor, maintaining smooth running and preventing any check engine lights or fueling issues. This attention to detail separates quality aftermarket exhausts from cheaper alternatives that may cause running problems or warning lights.

For owners of the related Benelli BN125 model, we also manufacture a Benelli BN125 De-Cat Down-Pipe header & Exhaust UK Made with the same quality construction and performance benefits.

Frequently Asked Questions

Will this benelli tnt125 exhaust require remapping?
No, the system is designed to work with standard fueling. However, if you’ve fitted an aftermarket air filter, professional fueling optimisation is recommended for best results.

Is the system road legal?
The system includes a removable DB killer. Legality depends on your local regulations regarding catalytic converters and noise levels. Check your regional requirements before purchasing.

What’s included in the package?
You receive a T304 stainless steel front pipe/header, your choice of rear silencer with fittings, O2 sensor boss, and a free removable DB killer.

How much lighter is this system?
The downpipe alone saves 2.3kg compared to the standard factory component, significantly reducing overall bike weight.

Upgrade your Benelli TNT125 or TNT135 today with this exceptional UK-made exhaust system and experience the difference that proper engineering and quality materials can make to your riding experience.