i'm gonna say this for the last time:
NOTHING YOU DO TO A STOCK MOBY EXHAUST AFFECTS PERFORMANCE AT ALL!!!
quote me if u want
unless u stuff it with shit and clog it up, then it will slow u down. u can run no exhaust and will see no gain or fall in performance.
believe me i have tried, all the stupid sudgested tricks to stock moby pipes, non do shit.
the only derestricting u can do is to take the airbox off the stock gurtner. also boring out a gurtner is not possable due to the intricite design and the way the difusser works, u also can't get jets for gurtners so boring it out is not worth it, since uy'd have to drill jets too.