Do you trust aftermarket coil packs? If so, which ones? I have an 08 WRX that has a bit of a stutter under load. I have probably put on 20k miles since the plugs were replaced, but that was probably 5-6 years ago. The car sat a lot over the last 2-3 years. I think I have less than 1k on in the last 12 months. I'm thinking it might be a good idea to do coil packs while I'm in there. Or do I just take a loan out and get factory ones?