Ok guys, so I am a new Mustang owner who is in the starting stages of building.. I have a 2000 GT bone stock. Im not a noob by any means, and i can do my own work. I have an X pipe, new intake with K&N filter, throttle body and plennum all planned for the near future. My question is if 75 mm is a better idea than 70, does name brand matter, and how will this effect my gas mileage. If you could help it would be great. Thanks....

 

Get the 75, you won't regret it.