well any time you increase exhaust flow its going to reduce back pressure on the motor witch cause more power especially at higher rpm range doesnt matter if its an automatic or standard its going to do the same....and all the piping cost about $100 then the tips cost $100 $200 is better than buying a cat back kit that cost anywere from $500 and up................P.S it is extremely loud though definetly not cop friendly makes your hair stand up lol

do u think adding striaght pipes on a automatic would help

sounds LOUD, how much did that cost? just the straight pipes i mean

i put my intake on the same time as i did the exhaust and those two together made the throttle response better and top end power so yeah.

can u feel the difference

no headers just straight piping from the cats back and other small mods

sounds good i have a 325 i do u have headers to

the bmw sounds serious