1. A LS comes with a V6, thus you have a RS.
2. The second gens (93-97) never came with a factory installed turbo.
3. Straight exhaust WILL sound like absolute garbage, especially on a four banger. I would be shocked if you made it a month or two w/o a ticket for your exhaust.
Next time do a search (and if you did search and found nothing, make sure to mention it).
If you are a mechanical engineer, why didn't you just measure it in the first place? That would seem like the most reasonable thought (for anyone, more so for an engineer).