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for a 500+whp setup that will see street time, I definitely recommend the S300SX 83-75. The ideal A/R depends on the boost level you intend to run. For under 22/23psi, i recommend the .91 a/r. For up to 30psi, use the 1.00 a/r. The housings both spool very similarly, but the .91 has a little...

hey guys - if anyone has any borgwarner turbo questions feel free to post up and ill do my best to respond. I work closely with the head engineers and can often give some insight and suggestions. BTW pass1914's link should definitely be read - some great info in there