I have a 03 Cobra (8500miles) that blows blus smoke on start-up, only on cold start-up, never on a hot restart. I suspect faulty valve stem seals/or worn guides. I called SVT to ask if they had any problems with this, they tell me this normal (since 1996)for these engines. If this is normal, then how many of yours smokes? Anyway the dealer is going to put a new left head on next week (ticking). I think I will go ahead and put the Apten cooling mod on while the tech has the engine out. Will the apten mod fix the smoking? will the pcv/seperator mod fix the smoking? If any of you had this problem I would appreciate your input on what you did to fix it. I love this car, but I cant stand for it smoke like that, its embarrassing!! Thanks!!!