hey guys just picked up my Rapid V2.0 from chris. looks the business and cant wait to install. I hear from a few people should be alright to put on and not tune as I am going to put them on then gather up injectors, hi flow cat and then get them to install the cat and injectors and tune it. should this be ok? also im not t sure about a flash tune and getting a xcal and tuning it...is a flash tune where you only have one tune on the factory comp and getting a xcal means you can have up to three? cheers