Cobb tune, touring axle back, ATP modular down pipe

[Frogger]

Got the Cobb tune and touring axle back already on the road. Just ordered the down pipe . Debating an aftermarket catback. Before/after down pipe vids soon.

Is it true catbacks do nothing other than maybe help the note?

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[DanFish]

I think the catback might see minimal gains but not much.