2013 sport build

megalapagas

After MONTHS of trying to figure out who was the member that made a DIY CAI....FINALLY!!... ok heres my questions, What Diameter is Z1 Post maf tubes not sure if they're 3 or 2.5"?? Also using the stock Air Box MAF location tube and having 3" in diameter before and after of course may require a tune but is there any gain with going 3" or sticking with a 2.5" diameter is a better option??

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GTM 34 Row Oil Cooler | K&N Drop Ins w/ Z1's Post MAF Tubes | F.I Non-Res'd 2.5" T.P w/ CF CBE | Axis Wheels | Piecing together My Own Custom T4 Top Mount Single Turbo Kit *Still in the works* |