You're right they have had 6+ years to figure something out. They have also had over 10 years to change the engine out from the current EJ257. I do not think the EJ is bad, its just outdated. In terms of price tags, do we think Subaru will really make the next gen sti a 50K car?? Thats about a 10K bump over a limited sti. That 10K extra better make everyone happy. As we know, wrx and sti sales are always on the up, but will they continue to rise after a big increased price tag.I'll preface with saying that I'm a FA fan being a previous FA20DIT owner. I was making nearly 330 whp with just a flex fuel E50 tune and mostly stock hardware.
But IF these rumors are true.. 400 hp from the FA24DIT (2387cc) would make for a specific output of 167.6 HP/L. That's quite impressive for a Subaru boxer engine with today's strict regulations. The S208's 2.0L EJ207 only has a specific output of 162.7 HP/L. And we weren't allowed to have that in the US..
Just for comparison.. the 2.5L turbo (H4) Porsche Cayman GTS (365 hp/317 lb-ft) only had a specific output of 146.2 HP/L along with an $80k+ price tag. The $200-300k twin turbo 3.8L 911 Turbo S (580 hp) and GT2 RS (700 hp) have specific outputs of 152.6 & 184.2 HP/L, respectively.
This would be quite a feat for Subaru/STI if they can reliably achieve this level of specific output from the FA24DIT while maintaining a broad torque curve. If they do.. I just fear to see the price tag that goes along with it. I'd expect that it would at least be approaching $50k.. let alone if they rework the drivetrain with torque vectoring and/or a DCT..
Then again Subaru has had the last 6+ years to develop a new FA engine for the STI while the FA20D (w/D4-S) & FA20F (FA20DIT) have been in the WRX, Forester XT, BRZ, etc.