Join Date: Mar 2010
Location: Pittsburgh, Pistolvania
If you're Naturally Aspirated (2.2L L61/LAP or 2.4L LE5), keep with the stock AC Delco Professional Platnums. If you're running the SS/SC and it is stock or just GM Stage II, keep with the stock plugs on those. The SS/TC I believe uses AC Delco irridiums.
If you're heavily modded and using forced induction, running a higher compression setup and you must use colder plugs, try sticking with NGK Iridiums.
GM Stage II | 2nd Gen Projectors | 5000K Low Beams | 3000K HID Fogs | LED Tails| SS/TC Seats
▲RIP 2007 G5: Totalled 1/26/10▲