Jegs has it for a little over 500 bucks. 1000CFM? Just a wee bit of overkill.

 

I'd like to see some dyno tests done with the stock 500cfm(with the A1) and compare it the a 1000. But the tune would have to set up for it. Would have to have good breathing/ported heads and decent exhaust and a healthy cam wouldn't hurt to take advantage of it.

 

I wouldn't worry about the Y pipe, I would just install the headers you want then have an exhaust shop run you 2.5" true duals with an H or X pipe and the mufflers of your choice.