the dreaded exhaust question (again)

[backman_z]

I am fairly new to the forum.
I have had my 04 Boxster 2.7 for less than a year.
I have not started tinkering yet, but plan to start this summer.

So I am not sure that I would take my word for it, but here is my 2 cents.

From what I have read here and on a couple other forums, the two things that most people seam to agree will give you the biggest bang for your buck:

1- Bypassing the secondary cats. This improves flow and decreases weight. Definate improvement in power, with the weight decrease, it is a combined big plus. Compred to some of the other exhaust mods, it costs less.

2- Underdive pulley. One of the cheapes mods available, and gains have been well proven. The stock pulley is 6 inches. Most of the underdrive pulleys available are 5", but there are a couple 4" one out there (Flat6).

This is where I am going to start; bypass cats and an undredrive pulley. Flat6 and his suppliers seam to be confident that the 4" pulley does not underdrive anything too much, so I will likely try their pulley. There is a guy near me with a dyno, so I am hoping to do a pre-mod dyno, and then on after each mod.