Motorcycle News (UK) - - Garage -

One of the side-ef­fects of the new Euro4 emis­sions reg­u­la­tions could be a re­turn to the glory days for per­for­mance ex­hausts such as this new three-quar­ter sys­tem from Yoshimura.

With the en­vi­ron­men­tal grip tight­en­ing, high-pow­ered bikes are be­ing more stran­gled than be­fore and fit­ting a race ex­haust sys­tem is once again de­liv­er­ing the im­pres­sive power gains it used to in the 1980s and 90s.

This Al­pha sys­tem is Yoshi’s lat­est de­sign, with a more an­gu­lar end-can that’s avail­able in ei­ther a stain­less steel or car­bon-fi­bre fin­ish. The link pipe is avail­able in ei­ther titanium (5.5kg lighter than stan­dard) or stain­less steel (4.2kg lighter), with the price re­flect­ing that.

But Yoshimura are open about the fact that ditch­ing the bike’s cat­alytic con­verter is re­spon­si­ble for most of the claimed 5% in­crease in power over a stan­dard ZX-10R.

The sys­tem is not road-le­gal be­cause of the lack of pol­lu­tion-con­trol, but a £39 noisedead­en­ing baf­fle is avail­able to keep neigh­bours and MOT testers happy.

Yoshimura don’t quote power gains in ac­tual bhp num­bers be­cause it de­pends on how much power the stan­dard ma­chine makes, and this varies from bike to bike. But it doesn’t take ge­nius-level maths to work out that a 5% in­crease on a bike that makes a claimed 207bhp means a gain of around 10bhp.

There are three ver­sions avail­able – stain­less steel link pipe and can (£472), stain­less link pipe with car­bon can (£579) or titanium link pipe with car­bon can (£900).

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