I am debating whether or not to get the Remus quad exhaust and an intake as well as a sprint booster. I have an extended warranty/maintenance till 2011. I dont want to mess anything up with the warranties but I want my 525i to not be a snail anymore! Well...at least it would be a fast snail I was even thinking of getting a muffler for the passenger side and not attaching them (just have matching tips) . The sprint booster I know I can easily take out before services which is definetly what I will do. Any advice would be great. Thanks!

 

Modifying most items of your car does not out right void the warranty unless the issues you're having is a result of the modification (i.e. engine blows up because the after-market exhaust had an obstruction or was incompatible, etc).