Add the spaghetti without breaking them. Allow the hot water to soften the noodles for a few seconds, then nudge the remaining pasta into the pot until entirely submerged. Give it a stir (the water should still be boiling) and set the timer to 1 minute less than the directions on the box.
After the timer goes off, drain the pasta, reserving the pasta water in another pot, and return the pasta to the first pot.
Add the lime juice to the drained spaghetti. Season with salt and freshly cracked black pepper to taste.
Add the marinara sauce and a quarter cup of the reserved pasta stock. Stir to coat the pasta and garnish with fresh basil.