The RCM400 is based on the Garrett GT29 CHCA, and is designed to spool up quickly but still deliver good performance in the upper rpm range. This turbo should spool up around 3,700 rpm, and make 320 - 350 whp on pump gas, and could make up to 400 whp on E85 or race gas.
The RCM450 is based on the Garrett GT30 CHCA, and is designed to offer great mid to upper rpm power. This turbo should spool around 4,200 rpm and make 350 - 375 on pump gas, and could make up to 450 whp on E85 or race gas.
RCM3194 - RCM400 - Single Scroll
RCM3195 - RCM450 - Single Scroll
RCM3291 - RCM400 - Twin-Scroll
RCM3292 - RCM450 - Twin-Scroll