Just get a damn SRI, they are all the same.

2.5-3" pipe from the throttle body to behind the headlight, the only thing thats ever different is the filter. Some are cleanable and some aren't, if its not just go buy a K&N.

CAIs are fine even if it does rain, but you do run the chance of hydrolock if you get near water.

SRI is noisy as hell and can be louder than a stock exhaust where a CAI you may not hear it as much.

Just go on Egay and buy a cheap $30 SRI.