A sausage won't make a good exhaust. I would personally get cat back if planning ever to do a downpipe. If just for sound axle back is fineYes might as well go fatback, you'll spend 150-200 more upfront but if you go axleback and ever want a catback you'll spend more than that anyways.
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Axle or cat back won't mess with anything on your warranty.Yeah I have the same question actually. Im looking more for sound not really planning on changing up the current performance of the car. Keeping it pretty stock due to my extended warranty. Im assuming axle-back would be fine