whats up guys, need some input, im finally planning to get an exhaust system for my 08 M5 but having a hard time deciding which on is best eisenmann or rpi? or is thier other good stuff out there?

RPI. Sound + power increase.

whats the difference between gt and gts? i actually want 4" oval tips. im looking for and aggressive sound but not annoying loud.

Those power gains are not something I would consider when it comes to exhaust since majority of these exhaust have a DRONE in your passenger cabin as you drive and then the other thing being
there are days that you want be feel like your on stock that why if I were you I would get

http://www.agency-power.com/catalog/...t-p-99088.html

agency power actually seems like something i would get. does anyone have this on thier m5

For an M5? 2 words or 3 letters suffice: RACE PRECISION or RPI for short, if you're going to do it, do it right :twoup:

M5 products

Contact member Nerweezy of Trinity Autosport for all your questions

yea i just saw a video on youtube on agency power, not really feeling it. now which RPI am i getting GT section 3 or street catback rpi? i want to get as much info on this before i do it.

I have an RPI on my 550i and love it! Just the right amount of growl without being obnoxious. On the M5 we have the Tubi, and all I can say is WOW!!!!

I personally have RPI (sec1 sec 2 and sec3 ) on my M5 and its great no complaints but loud all the time, lets not forget Cabin drone --- Not something I want to be doing all the time.
I like the valvetronic a lot since you have the option to do loud vs silent -- On the touch of a remote control button

Well did I forget to mention that the coolest thing I like about the AP Valvetronic is the ability for you to specify what RPP the exhaust gets louder (wwwwwwwoooooooooowwwwww)

Suppose you set the Open Port settings to 4k RPM and your at a red light

So when you hit the gas on green the car would be silent and pull but as soon as you hit or exceed the 4k rpm range it will get all loud.

Shift gears and its silent again if the RPM is below 4K and then when you exceed 4k RPM its loud again


LOVE THAT THING -- JUST LOVE IT

Anyway, to each his own

Sorry but I dont have a video, drive my friends car all the time when we are going places together cuz I love the Valvetronic, would have gotten one if it was not a big hole in my pocket again

Eisenmann Race oval is pretty good too. You cannot go wrong with RPI. My buddy just ordered an RPI GTS for his M5. I will let you know in a few days if you want!