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993 rebuild

Engine

1996 C-4 993 Carrera
109,000 miles
Mods: larger Fabspeed airbox, Fabspeed cat bypass pipes and sport mufflers, new 1997 ECU with flashing

I have three questions:

1. Many say do a top end rebuild now before significant damage occurs. Many say wait until oil usage is more than 1.5 quarts per thousand miles. My car uses much less oil. Leakdown was 15% in the worst cylinder and 6% in the best. Would you do a top end now or wait?

2. Do you have any experience with the Billet 911 heads made in the UK with claims of significant horsepower gains over the Porsche heads?

3. Also, I wondered if I can increase the size of the throttle bodies and if that is recommended with the mods I have make already.

Thank you. John

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