Bought it from Full-race and this is what they say
"The S300X 83-75 is quite possibly the best value in today's high performance street-turbo marketplace. The 83-75 has an ultra-high flow 68 lb/min 7 blade extended-tip compressor wheel and a 10 blade 75mm inconel turbine wheel with 4340 shaft. Recommended for use in quick spooling 500-680+whp applications. It uses a 7-bladed Extended-Tip compressor wheel w/ 60mm inducer & 83mm exducer. 4" inlet compressor housing with 3" outlet. Comes with a .91 A/R Twinscroll T4 hsg standard but upgrading to a 1.00 a/r T4 Twinscroll housing is recommended! .88 A/R T4 Singlescroll also available for undivided applications. This compressor moves more air than a 61mm GT3582R but with only a 60mm inducer compressor wheel to keep inertia low. Capable of efficiently pumping up to 45+ psi boost, this turbo generates big torque numbers. "
"The S300X 83-75 is quite possibly the best value in today's high performance street-turbo marketplace. The 83-75 has an ultra-high flow 68 lb/min 7 blade extended-tip compressor wheel and a 10 blade 75mm inconel turbine wheel with 4340 shaft. Recommended for use in quick spooling 500-680+whp applications. It uses a 7-bladed Extended-Tip compressor wheel w/ 60mm inducer & 83mm exducer. 4" inlet compressor housing with 3" outlet. Comes with a .91 A/R Twinscroll T4 hsg standard but upgrading to a 1.00 a/r T4 Twinscroll housing is recommended! .88 A/R T4 Singlescroll also available for undivided applications. This compressor moves more air than a 61mm GT3582R but with only a 60mm inducer compressor wheel to keep inertia low. Capable of efficiently pumping up to 45+ psi boost, this turbo generates big torque numbers. "
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