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No catback is gonna be more than 5-10 HP. Borla will be on the highend because of their straight through design. Flowmaster on the other hand is a friction/chambered design..which will perform the same, or worse than stock. I would do a Borla Axleback before a Flowmaster catback if price is an issue.
There is also the difference in materials. Flowmaster is 409 stainless, which is a lower grade and can rust. Borla is 304, which is the highest exhaust grade and does not rust.
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