Originally Posted by brucelidat

If you're just going to do the CAI, then you'll get good gains. But keep in mind that if you do more than 1 breathing mod, the first one will net the most gains while the subsequent ones will have very diminished gains. SO if you know for sure you plan to do a CBE or something, then the CAI may not be worth it for the gains. That being said, there will still be gains, so whether or not it is worth it totally up to you. Read up on it, there are tons of threads on CAIs, CBE, HFCs and their combinations. I personally didn't think the cost was worth it for the CAI after having the CBE and HFCs put on so I just dropped some K&Ns in. Your opinion may be different.