Sounds like a real V8 now...finally!
#1
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My Ride: 2005 BMW 545i 6spd sport Sapphire black...well satin white wrap
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After seeing a couple members here remove their resonators, I decided to give it a try...and I LOVE it! As soon as it stops raining outside, I'll get a sound clip for everyone to enjoy.
![](http://img.photobucket.com/albums/v422/motorcitym3/exh1.jpg)
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#3
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My Ride: 2005 BMW 545i 6spd sport Sapphire black...well satin white wrap
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I bought the pipe from a local muffler shop and the guys in my shop (Roush) welded it in for $50 NOT BAD!!!!
The install was real straight forward and only took an hour. We unbolted the mid section, cut it on a band saw, reinstalled the ends, measured the length and cut the tubes, added a small flat to clear brace in the middle, tacked the pieces together, dropped the front at the cats, welded the perimeter of the pipes, reattached the front, checked for leaks, then did a few drifts in the parking lot!!!
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My Ride: 2005 BMW 545i 6spd sport Sapphire black...well satin white wrap
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As far as performance, I didn't notice an increase or decrease off the line. I feel highway cruising may be slightly better now. I made sure to flatten the middle of the straight pipes to keep some back pressure. I'm sure that is why I didn't notice a loss in torgue.
I removed the two round resonators up front and the large collector near the rear.
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My Ride: 545i - GONE
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I wouldn't recommend having straight-pipes if you're planning on getting an axle-back exhaust later on, like the RPI....trust me, this is exactly what I just did. The build of the RPI exhaust is pretty much straight-through, so the muffler itself won't have much backpressure.
My exhaust setup now is straight-through completely to the RPI exhaust, sounds loud as hell, but no backpressure what so ever. Thus, huge loss of low-end and torque. I'm now going to have my resonators put back on next week because the difference is night and day, even with the Sprintbooster on "red". It cost me $200 to have all 4 resonators removed, now I have to spend even more just to have them put back on.
However, if you're going to keep the factory exhaust, then straight pipes is good...sounds nice and you should zip-tie the exhaust valve on your muffler to stay open. I didnt like how the factory exhaust look though, wanted something bigger and more flush with the exhaust cut-out of the bumper.
Goodluck!
My exhaust setup now is straight-through completely to the RPI exhaust, sounds loud as hell, but no backpressure what so ever. Thus, huge loss of low-end and torque. I'm now going to have my resonators put back on next week because the difference is night and day, even with the Sprintbooster on "red". It cost me $200 to have all 4 resonators removed, now I have to spend even more just to have them put back on.
![Getlost](https://5series.net/forums/images/smilies/imported/getlost.gif)
However, if you're going to keep the factory exhaust, then straight pipes is good...sounds nice and you should zip-tie the exhaust valve on your muffler to stay open. I didnt like how the factory exhaust look though, wanted something bigger and more flush with the exhaust cut-out of the bumper.
Goodluck!