I've owned my stock 01 a4 1.8t for about 3 months and I'm planning on doing some performance mods. I know this question has been asked a hundred times on here but i can't find a specific answer. I want to get the APR stage 1 chip, MagnaFlow 14815 muffler, and possibly a high flow cat. What hp and torque gains could I get from this setup. APR is rated for 50hp and 80tq gain, but I doubt I'll get that with just the muffler.
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