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We have used the EFR series before with underwhelming results. A large group of them end up with the turbine wheel missing and the rest tend to make horrible power. I agree some tend to spool nice, however a larger percentage we've used have performed poorly. On top of having weak power potential , the compressor covers and turbine housings are massive making fitment difficult.
We have been in business with Forced Performance for years . Their products have been extremely beneficial and reliable. Xona Rotor is a spin off with FP and Tial. It just made sense to us to continue using products we know and trust , as well as s great relationship we've built over many years
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