ok so im boosting my JDM d15b......i have a Spearco Intercooler The core size is 20" x 8"x 3". The inlets are 2.25 inches on each side. The total length from inlet to inlet is 29.5 inches.

Im running a Garrett t3 42 A/R and i have 2.5" I.C piping should i get 2.25 to match the I.C itself or am i ok running 2.5"?

Thanks
Justin

 

If you already have the IC tubing, I don't really see a reason to redo it. Just get some 2.5" to 2.25" reducer couplers.