Pre is best and IMO an easier install.
You can do it with the turbo installed but it takes 15min to pull it off so its worth the time. Shuff some paper towels up in the manifold past where you're drilling (make sure you can get it out). Drill and tap the rear bank. You can place it in the front bank if you want but #6 cylinder usually runs hottest. Clean it up slap the turbo back on and you're done.
Here's where it goes
[img=500x375]http://img.photobucket.com/albums/v642/C4L/1994%202500/pyro.jpg[/img]
You can do it with the turbo installed but it takes 15min to pull it off so its worth the time. Shuff some paper towels up in the manifold past where you're drilling (make sure you can get it out). Drill and tap the rear bank. You can place it in the front bank if you want but #6 cylinder usually runs hottest. Clean it up slap the turbo back on and you're done.
Here's where it goes
[img=500x375]http://img.photobucket.com/albums/v642/C4L/1994%202500/pyro.jpg[/img]