no welding or anything like that. Most people just cut the stock pipes in front of the axle because it is a pain getting them out w/o cutting them. Couple people have said they got them out by jacking the car up itself and letting the rear hang all the way down. See how it works for ya. SLP is easy as pie to install because of the 3 piece design. If you ever go with an aftermarket midpipe definitly go with LM2s or the Powerflos, LM1s are obnoxiously loud. Have fun with it.
'04 Mach 5 spd: bolt-ons, n/a.....12.09 @ 113...SOLD
'99 GT 35th Anny. auto: SLOWER but a nice ride & paid for.