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      01-20-2012, 07:12 PM   #5
dvpouldar26's Avatar

Drives: 2008 e92 328i, Porsche 987.1
Join Date: May 2008
Location: Beverly Hills, CA

iTrader: (4)

Originally Posted by ucla bruin View Post
So the 2 axle backs, although look the same, are internally different and sound different?
They are 2 different axle backs, both offered by RPI. The GT was introduced first and most hated that annoying tin can ringing sound, so they came out with s second version, the GTM. Visually they look different because the GT has its inlet pipe out of the side of the muffler while the GTM's inlet pipe goes in through the back of the muffler.

PS: Go Bruins!
E92 328i
Jet Black / Gloss Black Grilles / 8000k D1S low beam / 6000k HID fogs / GP Thunder 8500k angels & cornering bulbs / black reflectors / gloss black vinyled window trim / tints / smoked rear turn signals / black roundels / AC Schnitzer roof spoiler / VRS style decklid spoiler / Matte black Stripes / Rear fogs / matte mirrors / 19" LM reps / APR lip