hi i recently bought a 2001 TT 1.8t and am looking to upgrade im planning on an exhaust and intake was wondering which were the best for these applacations or if they even make any exhausts besides the borla. also ive read some of the threads about the revo tune but was planning on buying the GIAC ecu upgrade was looking for some info on the differences bettween the two and if the power gains were similar or which one was better any info would be greatly appreciated thanks alot