I put a garret t3/t4 turbo on this tractor. It came with an IHI turbo that cost $1500.00 to replace, the garret was $200.00. The exhaust manifold was custom made to accept this change. The t3/t4 hybrid was used to allow a quick spool-up at low rpm. The motor is blown now but the turbo worked perfectly. This is on the 3T90T engine which was used on the JD 950 and 1050.