as of recent have some white smoke from exhaust that could either be head gasket or possible turbo seal so am inquiring about a new purchase.The car has 120k on it, the motor has 4k on it and turbo has 35k on it although entire car sat for 8 years. Any suggestions for what to get? engine is stock , 50 hp injectors, chip is set for economy/ daily driving and car is mostly stock. Thanks, Ronjon