Generally HFC don't set CEL (I mean they can but most people don't have this issue). Test pipes do. My Berk HFC never triggered my CEL before I got my car tuned. You can have this taken care in a tune anyways. The tune doubled my power gains again, and made a night and day difference in the throttle response on my car so it was money well spent.
To me your talking about spending $1500 for 15 HP, but then $500 for 5 HP is too much expensive? We're not going to change your mind, and no doubt the CBE is much easier to install. The cats are a bit more difficult because of the top bolts on each side.
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