I have a 01 LB7 with 200k on it with the injectors going bad again. I want to stay with decent fuel mileage and I want reliable injectors. Is the a better injector than Gm offers or? What should I expect to pay for an injector? I have a good reletive who is a GM mechanic that will replace them for beer, plus he owes me. Just curious if I can get better.