the chargepipe going from my compressor housing all the way through both sides of the intercooler is 2.5", so i ordered an ebay CAI to make my upper chargepipe, but the problem is it comes in 3" (even though it clearly said 2.5" diatmeter on the ebay auction). i'm kind of stuck with it. i guess the quesiton is will i have any type of air flow problems if i mate the 2.5" charge pipe to the 3" charge pipe? i think i may have read somewhere that the volume of air is affected if the same diameter charge pipe is not used throughout the whole charge piping system.