Wow...that is less than most tips alone! My guessed would be that it might just be a straight pipe and not much of a "muffler"...so it is going to be LOUD! I would say skip it...unless you want your X to sound like those Civics with a "can" muffler...you know, those that you can hear them a mile away, but could barely get off the line?

Pseto, it might not just be $20+ bucks that you're throwing away. You could also be losing some torque as well.