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Originally Posted by why?
that's never true. Just go look at what the lunatics did to the 1.4, both in the sonic and the 124. They will always find a way to make things better and more powerful.
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You mention the 1.4L, I can't find anyone getting much over 200whp with it without opening it up (both Chevy and FCA). The 1.5L 3-banger BMW engine is in a similar boat. This Toyota 3-cylinder already makes more HP/L than those other engines do tuned, it makes more HP/L than a Focus RS or Civic Type R.
Will it have a flash tune that offers >5% improvement within a year? Absolutely. Will it push 300whp reliably without significant investment? I seriously doubt it. Can you build it into a monster with enough time and money, sure but with that kind of fantasy everything is a $100k check from being faster than a hypercar.
It's 167HP/L, the Ferrari 3.9L V8 in the outgoing 488 is 169HP/L. Toyota can't break physics. It is a very short list of cars that make more power/displacement than this car with a factory warranty, even shorter if you cut out cars that are >$100k.
It's a totally safe bet that there isn't much headroom left in this engine.