I understand PFL 2.5 / 3.0 models had shorter tailpipes than the FL models 2.5 / 2.6 / 3.0 / 3.2 models, due to the profile of the rear bumper.
Replacement GM FL exhausts have a welded steel tip with ends cut at 90° that rust (as opposed to the original tailpipes which had stainless tips angled at 45°) which make it harder to remove them and put replacement tips of your choice, but many aftermarket tailpipes don't have fancy tips so it is easy to fit a tip of your choice.
If you have any links for tips which will fit the twin pipe rear PFL 3.0 then let me know - I looked for ages and couldn't find any correct size and clearance to fit 
The last time I replaced a system on my 3.2 which still had the original GM back box with twin exit pipes and the stainless 45° tips, I bought a Bosal back box, and carefully cut through the weld blobs holding the two stainless 45° tips on the original, which then slid nicely over the twin pipes of the Bosal exhaust, and I secured them with some JB metal weld epoxy. It looked just like a factory system at the rear.
When I had my 2.6, the exhaust had already been changed, so when that corroded through, again I got a Bosal system and a 2.2 back box, and being the single exit pipe, I bought some stainless 45° tips off Ebay of the correct internal diameter (remembering to take into account they are secured by an internal sprung metal clip - I avoided the ones secured by a grub / self tapping screw), and again it just looked like it had just left the factory and it was very firm on the tailpipe.
Fortunately, I still have an old original 3.2 back box with the original 45° stainless tips to salvage when the time arrives.
I still have one left of the pair of tips I bought on Ebay which I can dig out and see if the seller still exists. You may have to get a pair and cut them both on the side where to the two would contact and take them to your friendly metal fabricator with the replacement back box and get him to put a blob of stainless weld on the two in the correct position. As you say, the pipes are very close and they may not fit without a small cut on the side where the two contact.
I also have a brand new original factory GM unused pfl 3.0 back box with the twin 45°stainless tips, still in its original packaging - whether I'll ever use it I'm not sure, as I don't have a pfl 3.0 Omega, and I certainly wouldn't dream of cannabising it just for the tips!!
This is of course if you are a bit anal about your exhaust tail pipes looking as 'original' - which I am....!
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Topic: Exhaust systems (Read 1179 times)