Probably about a 6 rwhp gain from an X-pipe. Not enough to "really" feel it.
If you want to FEEL the power change from an exhaust... You would need to do a FULL exhaust consisting of Long Tube Headers, Mid-pipe (X-pipe) and a catback. This will produce about 20 rwhp, which is definitely something you can feel.
FULL exhaust + CAI about 25 rwhp which is going to be a real significant gain for an exhaust, something you can definitely feel.
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