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Most exhaust shopping guides for a sport bike lead with horsepower. On the YZF-R125 that’s the wrong number to chase. The bike runs a small fuel-injected single with a stock ECU map tuned around the stock airbox and stock exhaust backpressure; bolt on a freer-flowing slip-on and change nothing else, and the midrange typically goes slightly leaner rather than stronger, because the ECU has no idea the exhaust changed. Owners on R125 forums who’ve actually dynoed the bike after adding a fuelling remap report real double-digit horsepower gains — but that number comes from the remap, not the can. Buy a slip-on for what it actually delivers: less weight off the tail, and a louder, more distinct note.
The number that should actually drive the purchase is whether the can carries EC or ECE type-approval, and under what condition. Because most R125 riders are on a licence that requires the bike to stay exactly as type-approved, a non-compliant exhaust is a real MOT and insurance risk, not just a style choice. Several homologated cans — Akrapovic’s Racing Line and Mivv’s GP Pro among them — are approved specifically with the catalytic converter fitted; pull the cat and the identical physical part is no longer road legal, even though nothing else changed. Others ship with a removable dB killer that has to stay in for road use. Read the certificate for your specific fitment, not just the brand’s marketing copy — the same model line is often sold in different homologation states across the R125’s three distinct generations (2008–13, 2014–18, and the Euro4/Euro5 2019-on bike), and a part built for one won’t necessarily carry approval, or even bolt on, for another.
Construction is where the real differences between these ten sit. Titanium (Akrapovic, some Scorpion and Yoshimura finishes) sheds the most weight but costs the most; brushed stainless (Delkevic, Mivv’s GP Pro, GPR’s Deeptone) is heavier but far cheaper and just as corrosion-resistant for a bike that lives outdoors; carbon sleeves (Mivv’s GP Carbon) sit in between on weight but scuff and discolor with heat exposure over time. A few of these are full systems that replace the header along with the silencer (GPR, Delkevic, Scorpion) rather than slip-ons that reuse the stock link pipe — full systems cost more and take longer to fit, but they’re usually the ones carrying the most complete road-legal paperwork.
Before ordering anything, confirm which of the three R125 generations you own by frame year, not just the model name, since fitment and homologation both split along that line.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Akrapovic Racing Line (Titanium) | $300–$420 | Amazon · eBay |
| 2 | Arrow Dark Thunder | $280–$380 | Amazon |
| 3 | GPR Deeptone Inox | $260–$340 | Amazon · eBay |
| 4 | GPR Furore Evo4 Nero | $310–$400 | Amazon · eBay |
| 5 | Scorpion Serket Taper (Stainless) | $240–$420 | Amazon · eBay |
| 6 | LeoVince LV One Evo | $220–$340 | Amazon · eBay |
| 7 | Mivv GP Pro (Stainless, Black) | $270–$360 | Amazon |
| 8 | Mivv GP Carbon | $290–$380 | Amazon · eBay |
| 9 | Delkevic Full Exhaust System (Stainless) | $180–$260 | Amazon |
| 10 | Yoshimura R-77 / R-77S | $260–$360 | Amazon |
The picks, in detail
Akrapovic Racing Line (Titanium)
Slovenian racing-exhaust specialist’s titanium slip-on for the 2019-on YZF-R125/MT-125 generation. EC type-approval on this can is valid only with the factory catalytic converter installed, so check that yours ships with, or already carries, the cat before assuming it’s road-legal straight out of the box.
- Titanium canister with carbon end cap
- EC type-approval conditional on catalytic converter fitment
- Slip-on design reuses the stock link pipe
- Sealed titanium weld construction
- Genuine weight saving over the stock steel silencer
- Well-known racing-exhaust brand with resale value
- Titanium finish discolors attractively with heat
- Road legality depends on keeping the catalytic converter in place, easy to overlook
- Among the pricier slip-on options for a 125
- Fits only the 2019-on generation, not earlier R125s
Arrow Dark Thunder
Italian racing-exhaust builder’s road-approved slip-on for the 2019-on YZF-R125/MT-125, aluminum body with a carbon end cap and a removable dB killer. Sold with the documentation needed to keep the bike compliant at an MOT or equivalent roadworthiness check, rather than a track-only can dressed up for the street.
- Black aluminum canister, carbon end cap
- Removable dB killer
- Road-approval documentation included
- Slip-on fitment reusing the stock link pipe
- Established brand with wide European dealer support
- Documented road approval simplifies inspection
- Noticeably lighter than the stock silencer
- dB killer removal for a louder note voids road legality
- Generation-specific fitment, 2019-on only
- No meaningful power gain without remapping
GPR Deeptone Inox
Italian GPR’s homologated full system for the earlier YZF-R125 generations, brushed stainless with a racing manifold, sold with the certificate needed for road-legal use in the EU and a removable dB killer that returns the bike to street-legal noise levels. As a full system rather than just a can, it replaces the header along with the silencer.
- Brushed stainless steel
- EC/ECE homologation documentation included
- Removable dB killer
- Full system including racing header
- Homologated full system, not just a slip-on can
- Stainless resists corrosion better than mild steel
- Documented EU road-legal certification
- Full-system installs are more involved than a slip-on swap
- Stainless doesn’t carry titanium’s weight advantage
- Generation-specific, won’t fit 2019-on bikes
GPR Furore Evo4 Nero
GPR’s current-generation homologated full system for the Euro4/Euro5 YZF-R125, black aluminum body with CNC-machined end caps and the catalytic converter built into its road-legal certification. Unlike the older Deeptone line, this one is sold specifically to keep the emissions-era bike compliant rather than as a track-only upgrade.
- Black aluminum body, CNC-machined end caps
- Catalytic converter included
- Removable dB killer
- Full homologated system for Euro4/Euro5 R125
- Certified compliant with the newer emissions-era approval requirements
- Includes the catalyst rather than requiring the stock one retained
- Two-year warranty from GPR
- Pricier than the older Deeptone line
- Full-system fitment takes longer than a slip-on swap
- Still needs a remap to realize any real power change
Scorpion Serket Taper (Stainless)
English-built full system available across all three YZF-R125 generations (2008–13, 2014–19, 2019–20), with a distinctive six-facet taper profile. Scorpion’s own published figures for the current-generation stainless version show a 1.91kg weight saving over stock and a claimed 0.6hp gain — a useful honest benchmark for what a slip-on realistically delivers without a remap.
- Hand-built stainless steel, six-facet taper profile
- Fitments covering all three R125 generations
- Carbon and titanium finish options also sold
- Removable baffle
- Widest generation coverage of any brand here
- UK manufacturing with direct warranty support
- Published weight and dyno figures rather than vague claims
- Stainless version doesn’t shed weight like the titanium/carbon options
- Six-facet styling is polarizing
- Still needs a remap for a real power change
LeoVince LV One Evo
Turin-based LeoVince, one of the oldest names in sport exhausts, sells a complete LV One Evo system for the R125/MT-125 range. It’s aimed at riders who want a long-established, widely stocked brand rather than a boutique or track-focused build.
- Complete system: link pipe plus silencer
- Stainless or carbon finish options
- Removable dB insert
- Wide dealer availability across Europe
- Long-standing brand with broad spare-parts availability
- Competitively priced against Akrapovic or Arrow
- Easy to source through mainstream European retailers
- Less road-approval detail published online than GPR or Scorpion offer
- Some finish options cost extra
- No meaningful power change without a remap
Mivv GP Pro (Stainless, Black)
Mivv’s GP Pro slip-on for the 2019-on YZF-R125 is EC type-approved for Euro4/Euro5 specifically when the catalytic converter is fitted, and ships with the homologation certificate. It’s a straightforward stainless slip-on rather than a full system, so it reuses the stock header.
- Black-finish stainless steel canister
- EC type-approval conditional on catalyst fitment
- Slip-on reusing the stock link pipe
- Homologation certificate included
- Documented Euro4/Euro5 type-approval
- Slip-on install is quicker than a full system
- Certificate simplifies passing a roadside or inspection check
- Approval is void if the catalytic converter is removed
- Fits the newer generation only
- Stainless doesn’t match titanium’s weight saving
Mivv GP Carbon
The carbon-sleeved version of Mivv’s GP line for the 2014-on YZF-R125, homologated for road use on that generation. Same internal construction as the stainless GP Pro, with a carbon-fiber outer sleeve for a lighter, glossier finish.
- Carbon-fiber outer sleeve
- Homologated for the 2014-on YZF-R125
- Slip-on fitment
- Stainless internals under the carbon sleeve
- Lighter than the equivalent stainless can
- Homologation documentation included
- Distinct carbon finish
- Carbon sleeves scuff and heat-discolor more readily than metal
- Fits 2014-on only, not the earliest R125s
- Premium price for a slip-on
Delkevic Full Exhaust System (Stainless)
UK-based Delkevic sells complete stainless systems, not just slip-on cans, for both the 2008–2013 and 2014–2016 YZF-R125, in a choice of oval, tri-oval or round silencer shapes, with a 12-month warranty. Delkevic markets these as fit-and-forget on an otherwise-stock bike — no rejetting or remap needed, though that also means no meaningful power change either.
- Brushed 304 stainless steel
- Full system including header, not just a slip-on can
- Multiple silencer shape options
- Removable baffle
- Full system at a lower price than most single-brand slip-ons
- 12-month warranty
- No rejetting required on a stock bike
- Not independently EC-homologated the way GPR or Mivv systems are, so check local road-legality rules before fitting
- Heavier stainless build than titanium rivals
- Generation-specific fitment
Yoshimura R-77 / R-77S
Japanese Yoshimura’s R-77 slip-on for the YZF-R125/R15/MT-125/XSR125 platform, using the brand’s trapezoidal muffler shape with a carbon end cap. In Japan it’s sold as JMCA-approved for road use; buyers outside Japan should confirm their own market’s approval status before fitting, since homologation doesn’t automatically carry across regions.
- Trapezoidal muffler design
- Carbon end cap
- Slip-on fitment
- JMCA road approval in the Japanese market
- Well-known race-pedigree Japanese brand
- Distinctive trapezoidal shape and carbon cap
- Same design language as Yoshimura’s larger-bike systems
- JMCA approval doesn’t automatically carry EC/ECE approval for European roads, verify separately
- Fewer UK/EU retailer listings than GPR, Scorpion or Arrow
- No meaningful power gain without remapping
Buying tips
- Confirm your R125’s generation by frame year (2008–13, 2014–18, or 2019-on) before ordering — exhausts are generation-specific and rarely interchange.
- Read the fitment-specific homologation certificate, not the brand’s general marketing page, to see whether approval requires the catalytic converter to stay fitted.
- If a certificate lists a removable dB killer, keep it in for road use; pulling it for a louder note is a closed-course-only move in most jurisdictions.
- Don’t expect a real power gain from a slip-on alone — a fuelling remap is what actually moves the dyno numbers, not the can by itself.
- Check whether the listing is a slip-on that reuses your stock header, or a full system that replaces it too — full systems cost more but usually carry more complete road-legal paperwork.
- Weigh titanium against stainless against carbon by what you actually want: titanium for weight, stainless for cost and corrosion resistance, carbon as a middle ground that scuffs with heat over time.
- Keep the stock silencer on hand if you’re on a licence in a market that inspects for type-approval compliance at MOT or equivalent.
- Torque the mounting bracket and clamp to the exhaust maker’s spec after fitting, and recheck it after the first heat cycle, since aftermarket brackets can settle.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.