[rtteg]

Why are most cai 2.5 inch? Are there any disadvantages to using a 3 inch pipe on a stock LS?

 

[SurferX]

You sacrifice flow velocity for flow capacity with a bigger pipe. An LS with stock cams and 6800 RPM redline isn't in dire need of more flow capacity.

 

[Frank]

yeah, i got a cai from ebay a couple of months ago and fitted it with a k&n filter , the piping is 2.5' and the performance kinda tends to suffer a bit on the low end, but thats just coming from me, the mid range is where the power shines, and it kinda sorta stays the same, if not improves by a little on top end.. all in all, good deal for $120 including the k&N filter...

but am planing on purchasing a AEM cai in the future

Frank