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this topic has been discussed a few times on the forum. You can search for them in the exhaust section. but to answer your question.
1. You can buy Qual tips to weld on to the OEM mufflers, but you have to cut the original tips, cut a lot of the quad tips, and weld on to the mufflers. it won't cost much, but since your car is a lease, the dealer will definitely know you did something and I am not sure if they will accept it even if you change the tips back.
You can buy a bolt on catback system. I don't know if you still need to cut, but at least it will not be as noticeable when you put the OEM back on. It will cost a lot more than changing the tips.
Sorry, didn't read your message carefully. If you want 550 tips, I don't think you can just change the tips. They won't line up since 535 mufflers has one out let in the center, 550 has two. You will have to at least replace the mufflers and do a axle back system.
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