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Oops, lol, you're right, they do only have 1 3/4 inchers... Well, eventually I wanna go stroker engine, but for now (possibly 1-2 years) its just gonna be boltons. I know 1 7/8 is overkill, even on heads cam 5.7, but that way I wouldn't need to upgrade later when I do go stroker. But I'm glad you caught that! I'm fine with 1 3/4" primaries. Either way, the TSP's might not even happen, I got a local guy that offered me a set of TPIS stainless long tubes and X-pipe for very, very cheap, just 2 of the primaries had dents in them, easily fiixable for me
My future mod list, and most likely in this order:
Current mods:
Fast 78mm
Corsa cat back
EfiLive speed-density tune (by me)
MAF delete
EGR/A.I.R. delete
Future mods:
Long tube headers
Cat delete
Wet N2O kit
3.42 rear
Built trans & 3200-3600 stall
Heads/Cam/Rod-bolts
Well, if you plan to go H/C/I then by all means 1 3/4" is enough and since you only plan to have this setup for only a couple of years the TSP Longtubes will do perfectly fine. I myself went with Kooks 1 7/8" Longtubes and O/R X-pipe since my plan is to go SC'd but that'll be within this year. Your plan sounds great through and it should be a badass car. Best of luck to you.