Whats a good size intercooler for a series 5.. need help badly>>

 

it really depends on the rest of your setup....elaborate.

 

intercoolers do not all come out of the box the same, two of the same size but of 2 makes can fit completely different. what you have to do is become familiar with a tape measure and your fabrication skills. this is just something you pick up on your own that can't be taught easily.