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522 Posts
Putting an exhaust on does not void the warranty. I talked to my Mazda dealer prior to putting my exhaust on to make sure of that and he told me it's all good. As per HP, I believe it does give more hp because it is less restrictive, but I'll let someone who knows the more technical explanation answer that for you. I really like the greddy exhaust i had installed and i noticed the car seems a little faster.
