I got a 63 mm bored TB and it has better response. Mainly because the the opening is larger and the neck down is milled off. But I dont race. It was in pursuit of better mpg, and in prep of more to come. Then I realized my next step cost more than I was willing. And I was getting away with what suspension I had on almost every trip. And as mentioned the CAI gains were relearned in 500 miles So, i have a different intake??
Of course my butt dyno could be off.
Never look down on anyone unless you are helping them up - Jesse Jackson