You'd have to REALLY over tighten them to do anything like that, and even then something would break. Check fuel pressure with KOEO and see if it drops.
Retros, LEDs, SD Hood GMPP, Votland, Addco
06+ Impala brakes, L76 Springs, ERs, Self-Tuned, 3.5 Gen V L32, Ported TB, 240a CS144, SSAC, Upgraded Transmission, Android Head Unit, Remote stuff, GXP Seats