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Originally Posted by ekaz
I had 2.5" straight pipe put in mine. The main difference between the X-pipe and the striaght pipe is that the later evens out the exhaust note, elminates the "pops and burbles" when decelerating. I personally like them. 
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Did you mean to say "the former"? Do you get a few pops and burbles with your straight pipes? I suspect they're a bit louder than the X-Pipe as well, but don't have access to your X to compare!
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'08 335i Coupe - Barbera Red / Saddle Leather / Light Poplar Wood / 6spd Manual
Options: Sport, Premium, Cold Weather, Comfort Access, Active Steering (awesome!), Power Rear Shade, IPod Adapter, Navigation w/IDrive
Mods: M6 Wheels, Split Armrest, M-Steering Wheel, Euro Light Switch w/Rear Fog Lights, Short Shift Knob w/Matching E-Brake Handle, Clear Reflectors, CDV, Clear Bra
Retired:'04 X5 4.4i
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