ATP Turbo Bolt-On GT2860RS Turbo Subaru 2002-2007 WRX / 2004-2019 STI



GT2860RS: The smallest of the ATP bolt-on WRX & STi turbos, the GT2860RS AKA "GT28RS," is good for small engines, like the 2.0L EJ20, where fast spool is a priority. The GT28RS uses a 53.85mm turbine wheel with a 76 trim and 60mm, 62 trim compressor wheel to provide good spool characteristics and a nice power upgrade

ATP recommends that you use a bellmouth downpipe with their bolt-on Garret WRX & STi turbos for optimal performance. Stock-type flat plate WRX & STi downpipes (HKS, DC Sports, etc.) and divorced wastegate downpipes (Perrin, Invidia Divorced) do not allow enough clearance for ATP's custom wide-swinging wastegate door. This can result in boost "creep," "spiking," and inaccurate boost control. The Turbo XS & Invidia Bellmouth downpipes would be good choices for use with this turbo.
In addition, ATP reccomends a higher flowing 3" turbo inlet, like the Perrin, Agency Power or APS. If you must use a stock-sized inlet, you will need to source a 2.4" to 3" reduction coupler, as the ATP turbos have a 3" inlet.We recommend using a matching-sized 3" inlet for minimal restriction, since GT turbos thrive with minimal inlet obstruction. ATP's tests have shown that these turbos, when used with the stock sized 2.4" inlet, produce significantly less power than when used with the 3" inlet. When coupled with a 3" downpipe, the 3" inlet promotes faster spool, and higher power numbers with less pressure at the manifold.

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