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If it's 4" all the way through then the fender hole will need to be opened, yes? Or is this an ID vs OD thing?

HemiSam
 

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Mine fit right through the existing hole in the fender. No cutting/drilling required.
 

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From searching for a replacement filter I learned a few things.

1. Spectre no longer makes this CAI.
2. It is not 4in as SpeedLogix website states but actually 3.5 and that is why it fits without drilling.
3. The guy who designed the long ram CAI said he was able to get more performance from their current short ram by upping the diameter to 4in.

This leads me to believe that a true 4in long ram CAI, such as LMI's would be the best overall solution. But will need drilling/cutting.
 
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