[ Mike Bigus <gtivr6r@chicagonet<img src=/i/dn.gif border=0 width=35 height=15>> wrote: ]
ben t wrote:
> I have been told by 2 tunning shops that the quietest aftermarket exhaust
> in the business is the Brospeed system. I have also been told that it will
> rust out in about 1-2 years so I will be buying another muffler in a couple of
The Brospeed system is the quietest but yeilds the most power and torque
over the ENTIRE RPM range. Rust out in 1-2 Years?? I seriously dought
considering its made entirely of 304 stainless steel, not to mention
the header is ceramic coated to help reduce under hood temps. The
will generate 19 HP through out the entire RPM range, and the CAT back
exhaust generates another 12 HP. Combined figure 18-20 total HPs.
The Header runs $550 while the exhaust runs $600. The exhaust system
uses 2-1/4" tubing while the Techtonics uses 2-1/2". Velocity caries
the Brospeed stuff.>>
Alright, Mike... this I have to respond to. Do you have any idea what 18-20
*real* hp can do for your car? Not magazine hp, not "total" hp (pre and post
peak added up), not crank hp calculated with a 20% correction factor, but
honest to goodness real hp? 18-20 is A LOT!! Even 5 real hp is very
noticable... the Brospeed header back system produces nowhere near 18-20hp.
A certain list member (I'll let him reveal himself if he wishes) volunteered
his GTI VR6 to Bosal as a test car to develop their complete exhaust. In
exchange they gave him a system for free. They also provided dyno sheets from
the session. They, too, claimed astronomical numbers (18% increase if I
recall correctly), but funny thing was that their sheets didn't show this...
kind of. The hp sheet showed a 1-2 hp gain at various parts of the curve, and
the torque sheet showed similar gains. However, the superimposed curves sheet
revealed the elusive 18% gain... on a Euro GTI as stated in the tiny print at
the bottom. Now, I don't know why the system should make any more power on a
Euro version VR6, but the whole deceptive pitch turned me off.
Then we finally installed the complete system on the list member's car.
Overall, nicely constructed system... except that the header leaked badly at
the head, was incorrectly jigged and sent the midpipe on a slant towards the
side of the center tunnel, and the exhaust tips were 2" too short. This was
about a month ago, so the system was well out of prototype phase. Anyway, I
expressed my concern to the Bosal rep (very interested in the install since
the customer was being sponsored by them at the Englishtown event), and he was
very apologetic. Power increase was described by the customer as "minimal".
So, while this system is certainly the quietest aftermarket VR6 exhaust out
there (really no louder or different in tone than stock), has all the
appearance flair that some people look for, I have been less than overwhelmed.