Your right that the passenger side looks not very different. But it has the same differences as the driver side.
Here you can see the difference a little better with the old manifold.
you can see that the pipes are a little longer, the pipes go a little bit more to the front of the car, close to the other pipe., and (you can't see offcourse) the manifold is much 'smooter' insede.
I can't say if you feel the difference of only the manifold, because I had the whole engine done in once.
The advantage is that the engine has a easier spool up, specialy in low rpm's it helps and the engine runs very easy and smooth.
The sound is indeed different (in a good way) since how I drove before. I really like the sound how it is now.
And will enjoy the car as much as possible
