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That’s because MSRP sucks almost as bad as the stock active muffles. They sound like glass packs. No where near as good as Borla or Corsa

My car does this exact same thing

They want you to buy the 650 so probably won’t make improvements to the 550 there’s nothing to gain for them

Same here

I had a 550 and have now a 650. Loved them both. It’s hard for me to compare speed since 550 was manual and 650 is auto, 550 was just a premium 400 and the 650 is PP premium 401A, so of course the 650 seems like the better car to me it’s got more goodies. I think it depends what you want to do...