I have a question.

Last summer I had a friend (before he was reassigned by the Air Force) who was running stage 2 on his 07 IRL and got the saturn motorsports big bre throttle body. He said he noticed the difference between before and after installation. He claimed he ran faster than the supercharged police dodge chargers with the 5.7's. Anyways, he said it came with a tune that was done by the dealership. Just how beneficial would a larger throttlebody be on the LSJ's? I've been considering purchasing this very soon, then getting stage 2. Also, due to the fact that the diameter of the tb is larger than oem, it has been recommended that i have the snout of the supercharger be machined to the same diameter. Is this going to be necessary?

Here is the part I'm referencing:
Saturn Motorsports