<snip>

yes it could be a problem.  your particualr engine requires a certain amount
of back pressure from the exhaust system to funtion properly.  when you
increase flow through the exhaust a general rule is that you gain top end
horse power and lose low end torque.  remember the old adage, give and take.
once you hit the point of dimenishing returns, you lose so much torque that
you will see a significant decrease in bottom end performance.

on an engine that has been hotrodded with heads, cams and higher compression
ratios you need to get a good bit more flow to maximize these alterations
but on a mostly stock motor you can flow the motor too much.

we had a guy recently complaining about how he had put a new high flow
exhaust system on a 2001 ram with a 360 and it wouldn't hardly roll off the
line.  my wrench went out and crawled under it and then told the guy to take
it for a drive.  the guy came back grinning like a monkey and was very
happy.  he said it was like a new truck and asked what the wrench had done.
the trick was he had taken a big pair of channel locks and squeezed the
exhaust pipe about half way compressed.  this increased the back pressure
and fixed the problem.

my wrench then told the dude to fix it right, he needed to go put his
original exhaust manifolds and catalytic converters back on and use only the
portion of the new exhaust system that is behind the cat.  this guy got mad
and cussed us out.  that couldn't be the problem, he said, and he continued
by saying that they had already discarded of the factory parts.  he was very
mad because the *book* had said the new exhaust would be better and we
couldn't know more than the *book*.  but the proof is in the pudding.

so if you are going to add a cam and do head work i would suggest a
completly new free flowing system.  if all you have is a performance chip on
a stock motor then buy a good cat-back sysem and leave the forward stuff
stock.
michael

Here a picture of my car, and some of the specs.  I
think the only thing I changed was the brakes.  I'm now
using some huge Wilwood brakes.

http://www.milehicobraclub.com/member.php?MemberID=13

Here's some other pictures I've taken over the years
since I started building it.

http://s13.photobucket.com/albums/a256/bobcowan/

The superformance is a good car.  The build quality is
excellent.  But it's a bit heavier than other Cobra's;
and it's very expensive.  I think their price just went
up to around $79K for a roller; but that could be just
a vicious rumer.

Here are two good sites to get more information about
FFR's and other Cobra kits:

www.ffcobra.com
www.clubcobra.com

If you want a good car, and don't want to build it
yourself, consider a pro building a FFR for you to your
specs.  Might even be cheaper than a Superformance.