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Hi!
In most cases the discussion is about the engine HP and not the RWHP. Depends on the car and transmission the difference is about 15 to 35%. And of course the engine HP is more impressive to discuss.
In my case the Roush 427R with dual plane intake and a 870 Holley produces 541,4 HP.
At the Mustang dynamometer the RWHP is 451.7 HP...thats a loss about 16%.
Think thats a good result for a Superformance with stock headers and exhaust and no engine modifications.
Greetings from Austria
Peter
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