Do yourself a favor and have them build a full catback with aftermarket tips rather than cutting yours up. Some oblong tips should look good.

This way you will have several choices:

1. If you don't like it you can sell the magnaflow setup and slap on your old one

2. If you like it you can sell your orginal catback and probably pay for your new one.

If you don't do it this way and you hate it then you will be trying to re-weld on the old system or looking to buy another factory catback (which is not cheap). This will cost you more money in the long run as the otherway will probably pay for itself.

-marc