In general, when we talk about 125 sports bikes, the hare usually jumps that as with two strokes none, but we are going to have to get used to the idea that the hole engines are going to be relegated to some tests on the circuit and little plus. So on the street what we will see more and more are four-stroke motorcycles with more or less performance. The moment the Aprilia RS4 125 many put the cry in the air for the poor benefits that were guessed, but in GPR they got down to work to solve these benefits as much as possible.
With your escape GPR Ultracono for the Aprilia RS4 125 They promise an increase of 2.5 CV (16.6% more than the original power) although they do not specify if this increase will be with the version approved for the street with its dB Killer or in the more open version approved for the circuit. On the technical side, the new exhaust weighs 2.5 kg, uses a 304 stainless steel manifold, a 96 mm diameter and 200 mm long silencer made of TIG hand-welded titanium and a tail made of carbon fiber.. The prices are to think about it, because the street version costs 400 euros for 315 the circuit version from which you can easily extract the dB Killer.