the deal with bpv is it does fit the rsx, however it wasnt really considered when making the tubing for the intake. the only feasable place to put it is just as low as the filter itself so it wont be of much help. plus you physically have to cut the tube since theres only 1 section for the rsx.

something to keep in mind....the filter has to be almost completely submerged for it to start sucking in water. rain will drip off the filter so unless youre going swimming with your car i wouldnt worry about it. ive han mine since the beginning of the summer without problem driving through heavy downpoors at times(the ones that are bad enough to stop traffic on a highway).