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Message: [QUOTE="Gearhead, post: 710998, member: 503"] On a 7.3 engine with enhanced airflow like ported heads and a cam, the GTX 35 would be in it's efficiency range perfectly up to about 25-30lbs of boost. It would also spool up better than the 38r does. By the time the gtx35 is at 15lbs of boost the x4202 would be ready and willing to start adding airflow as it would probably be already in its efficiency range. If you really wanted to get cat's-azz with the setup, put a air to water heat exchanger between the stages and the air to air intercooler after the final stage of the compressor. The thing to remember in compounds is that you are dropping the pressure ratio of the chargers and the lb/min drops accordingly. The gtx4202/gtx35 combo would flow more like a gtx4294 as a single but with lower drive pressure overall. Since the 42 has a smalish turbine, I would run a 1.15 or the next size larger exhaust housing. [/QUOTE]

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