well its dependant on what you want to spend your money on and what you want to use your car for... I use mine more for auto-x events than anything else so the twin scroll with the STi block is pretty balanced. I've driven in high horsepower subaru's and the same thing happens every time the person corners... Oversteer and torque steer - it turns into a monster the more power you have..
Not saying that ALL high horsepower cars are like that, because it was mostly dependant on the driver behind the wheel of each car...
For me, the balance of the tuned vf37 is almost perfect for the driving skills that I have... I would like to attend Skip Barber Racing School BEFORE I start pushing over 400 WHP... Realistically, thats alot of HP for myself, especially if its a daily driver. If it was my race car (which it soon will be), then things would be different. As for now, I'm just trying to get it to run reliably and at a consistant power band - suspension/tires/weight - etc - are the rest of my focus...
watch the video's if you need to see the 0-7k rpm roll. no double clutch, just WOT, mild launch, and all boost.-www.freewebtown.com/deathinacan66
the vids take a while to come up but they do work. Links are on the left hand side of the page.