I put them on my msp, because when you launched half way hard the exhaust literally bounced up and down, I couldn't stand it. I've had them in for about a month now, they're ok. I agree with 1st Mp3, the exhaust actually shifts sometimes from side to side... sometimes it vibrates pretty bad too. Believe me though, the exhaust does not move up and down at all anymore... which is what I wanted, I guess