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Warrranty is ok on aftermarket exhaust as long as you dont mess with cat. As far as backpressure i would be very carefull. I just installed a flowmaster Hotrod hemi kit yesterday. I do feel loss of low end. Not alot, but i can tell a difference. If the computer dont adjust too it, i may go back too stock. It sounds sweet as hell though! I love the sound. Be very carefull about what exhaust you choose for your trucks. Hemi is stock with 3inch so i didnt think it would lose anything. It may not have, but it feels like it atleast. Just do alot of research on your exhausts before you change.. Good luck guys.
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