DONT cut the cat out...youll never be able to put it back in (w/out a
welder, etc) !
The MBRP test pipe fits the stock exhaust (and just about every after
market system out there).
the MBRP test pipe is EXACTLY the same length & size (including the
flange & bolts) as the factory CAT.
Ive personally installed THREE of the MBRP test pipes, one on a completely
stock factory set up, one on my own mbrp turbo back system & one
on a factory/silverline set up.
Ive swapped the pipe in and out w/ the cat on TWO of the three trucks,
its an EXACT fit, no cutting, no welding <EVER> !