If 50LBS is important enough to you to accept the down sides of removing the tail pipes, what kind of racing do you do? If it is drag racing, 50LBS over and behind the rear axle might well aid the hole shot.

Most tail pipes won't weigh 50LBS. A few might, but most won't. When you pull them, weigh them and let us know what they weighed and what impact it had on your performance.