The Kyosho IG159-550 is a heavy-duty orange shock spring designed to stiffen the suspension of the Inferno GT3. It is specifically made for the IG158 Threaded Big Shock Set and is the firmest choice offered, suited to drivers who need tighter handling at speed.
Compared with softer options like red, purple or pink springs, the orange spring gives a noticeably firmer ride and reduced chassis roll. That makes steering inputs more direct and predictable, which benefits lap consistency during competitive driving. The construction focuses on durability for repeated track use.
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