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Thank you all. But my plans are to do external mods only for track and autoX. My motor has very little miles (about 30K miles) and don't plan for major changes until the motor needs to come apart. Then it will become full race motor to include mods that several people talked about. Phase 9's are for track only at this time. I am in middle of designing a new exhaust system to combined both left and right banks to get proper scanvaging. Flow analysis on computer looks promising.
I am still curious as to what is achieveable with let say 46mm PMO's versus my current motronics with SW chip upgrade. Steve W. published very good dyno data showing improvements with his chip few weeks ago. But I really see no data with just carb change on this board. Most are full out conversion with major internal mods.
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74 911S 3.2 GTS
74 914-6
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