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Originally Posted by JNoSol
Don't be ridiculous on the warranty concern. This mod just control the valve flap of a muffler. Your engine isn't going to blow up. My experience with BMW warranty is very good. Unless you are making 700WHP and bent some piston rods, expect your warranty to be honored. This isn't a GTR or EVO, where they find every excuse to void your warranty. This is a BMW.
For that price, get a JB4. It control the valve flap and give you 100HP. Even my SA and CA have JB4/Catless DPs on their cars.
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I know a few people with bent rods and 800HP that got covered under warranty. Not trying to prove you wrong but rather show the OPS that controlling your exhaust flap is least if their worries.