[Erich]

Those tubes look thin and resistance goes up exponentially with diminishing diameter (flow rate equation). A small increase in diameter will greatly increase the flow. A small decrease in diameter will greatly decrease flow according to the equation. This applies to gasses and liquids as well. These pipes look as though they may be even thinner than the stock ones. I don't know if their system has resonator though. I wouldn't buy it unless it had a diameter larger than stock if I was looking for HP.
Mike 750iL
----------------------------------------------------------------------
shogun, my BMW mechanic/buddy had one of these tri-flow systems in his shop for a customer whose 7 got totaled. He offered to put it on my car and let me try it. More noise, especially resonator clatter, but I noticed no increased performance over stock. Just my opinion, didn't dyno it to check. I had the system removed and put on an aluminized version of OEM. Less noise, but still sounds great when you're up on the cam. Performance seems equal if not better. The tri-flow may offer a slight advantage at high rpm, but I really don't live there all that often. Hope this helps.
wildbill735
90 735iL, Black Stealth Beast
------------------------------------------------------------------------
The exhaust system is ONE thing that the 750 does NOT need. Stock is MORE than sufficient. Gawd - four down tubes into two collectors and double pipe all the way to the back ? An aftermarket system would have to be HUGE to make any perceptible improvement, except in the noise department.

Or get one of those 6" red anodized pot metal "exhaust tips" spewed out by some factory in China - that have displaced "real parts" on the shelves of your local auto supply store.

Mark Petry
Bainbridge Island, WA
--------------------------------------------------------------------------------------
Some people like the car and drive it a particular fashion. Others are a bit more into modifying and making it faster/aggressive.
Sammy d
--------------------------------------------------------------------------------------
The one is for 750i. True, so it would be perfect for a debadge one...Makes it look like a non V12...I prefer to keep the square ends...
dejongi
----------------------------------------------------------------------------------------
Nun ja, Leistung scheint da wohl nicht mehr rauszukommen, wenn ich die Kommentare lese.
Sound ist wohl anders.
Und das ist nun man eine Glaubensfrage, wie es jeder individuell bevorzugt.
Da ja ab Kat durch den neuen alles wegfaellt, waere es evtl. eine Alternative, wenn man mal den Originaltopf erneuern muss. Aber da sind da noch die Herren, die den abnehmen und eintragen muessen.