rear borla mufflers,inlet/outlet offset?

after searching on here for a little while i think i need an offset inlet and a center outlet?

anyone with these muffler on an 89-91 SC (older gas tank)
 
Ive got the longer borla mufflers on ( 16''or 18'' cant remember) my 91 with the older gas tank. I love the sound of the borlas. If you want to meet up to see/hear them give me a call, you could also check out my slicks too. Ryan 1-440-724-7294
 
this wont be installed until the first week of september but heres my final verdict for the complete system.

-Ported Manifolds of course :)
-Wynn Carters 2.25" Downtubes w/o cats (shhhh)
-2.25"downtubes to 2.5" adapters
-dual 2.5" into magnaflow resonator with 3" outlet
-3" from magnaflow to the rear
-3" to dual 2.5" "Y"
-2.5" inch to each borla muffler

think thatll be good up to 350-375hp? :confused:
 
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