This is my new custom dual 2 1/2 inch exhaust over the axle with an H pipe and dynomax welded ultraflows.

A pic from the back with it up on the lift.

under from the left side

under the rearend of the car. showing the H pipe

the midered joints going from the Hedman LT's under the crossmember.

the hanger on the mufflers.

With this exhaust I have around $170 into the mufflers. 3 sticks of pipe 8' each $75. and the hangers about $20. I also used bits and pieces off of my single exhaust 90's and stuff like that. so for less than $300 you can have a dual exhaust kit out the back that is quiet inside the car but echos the neighborhoods outside. also the hedman long tubes ceramic coated $385.there was barely any mods done to the floor other than the back where the subwoofer box sits. and by looking at it you cannot tell it was touched. The performance gains where huge at the track i gained over 3 MPH and 2 tenths over a 3 inch single kit with a y dump. it is around a 6 MPH over the entire single exhaust. i figure around 40-50 horse increase over the old kit. not to mention it sounds awesome. ground clearence isnt really an issue by me, i only scrape on the big speed bumps. I have about 4 inchs at the lowest point.
sound clip.