Or you can buy ZZP's flex and have a shop weld it in, whatever you decide. I bought band clamps and copper RTV and mine still leak, hopefully I can fix it.
If I were you and you planned on going farther, skip the aeroforce and tune and buy a used HPT. Best thing ever. And JSYK I think that k&n piping is small, like 3" or 3.5" compared to 4" DIY or other Aftermarket kits. If I wasnt going to make my own Id get one of ZZP's intakes.