dude, if it didn't do it, they wouldn't claim it! MSD are a highly respected tuning company and to be honest i have never heard anybody complain about any of there work! From what i can gather though the only complaint i have ever heard is you are obliged to make the tea whilst there, as they spend so long making sure your car is spot(quality takes time!!) on that dehydration sets in!

go for it mate!

Pugo