I did lots of research before installing my Pacesetter Longtubes on my 93 Z and found a few items that I had yet to see mentioned so I thought I'd throw them out there.
First, the oil pressure sender had to be relocated. Apparently it is in a different position on the 94+ cars. The driver side header was right up against it when I was squaring everything away so I put an L bend on the side of the block where the sender used to go and attatched the sender to that, so that it paralleled the block, this way it cleared the primaries.
Second, the steering shaft has "ears" if you will on it that would hit the 3rd primary on the driver's side. These had to be bent inward (hopefully not making my car a death trap) in order to clear the primary.
I had a few more things to mention that I'll add with an edit if I recall them. Hope this tips help someone out, or make them think twice.

Definitly worth it though. Sounds awesome.

 

I always see people write about the experiences with the long tubes. I have the mid's and will install as soon as the copper flange gaskets show up. Who has done the mid's and how easy was it? I am interested how mine sounds when done. The car sounds great already so we will see. I am only doing this because the back bolt broke and i caught the fever reading all the stories about them and the performance gains.