it's obvious that Turbo produces more hp than the SC, but I think if I was going for speed, I'd go with the TRD
SC for a number of reasons...
1)it's under Toyota warranty and you're getting a TRD
product, and everyone knows that TRD
's products are beautifully made with the best quality parts and perfectly fit to our cars and you can bet your ass that it'll be reliable.
2) I remember hearing something that said that the TRD
SC is CARB approved. Well since I live in Cali, that's a huge deal because it means it's the only forced induction that's legal.
3) it's a constant hp increase compared to the Turbo which only gives you hp when you gun it and get into high rpm's.
4) I also believe that it puts less stress on your engine and therefore maintenance and engine problems are kept to a minimum which is extremely important for any daily driver.
just my thoughts...