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Peak HP with EFI is not going to be any different than peak HP with carbs keeping the induction flow the same. Getting from idle to WOT is where EFI has an advantage if there is one.
To build and EFI system that matches the performance of Webers is more than what you describe. Common plenum systems won't get there with regard to throttle response. Individual throttle bodies are not cheap to buy or to build from motorcycle parts. Although these parts can be made to work, not many motorcycles came with 46mm TBs. The Triumph parts in Al's build are 38mm, not near big enough for a hot 3.0.
Your friends 3.6 made 172 rwkw which converts to roughly 230 rwhp if my math is correct. My 3.0 makes close to 240 at 6,800 with Webers and pump gas.
I know an EFI system can be put together with various parts and pieces but it's not what i would call plug and play. I've had a tool box since I was 12 and would not feel comfortable trying this on my own.
As a side note; The NASCAR boys went to EFI this year on top of a manifold. The results? Down about 50 hp across the board compared to last years numbers with CARBS...
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