im planing to put ams headers ,pulley, and 2nd highflowcats. i would like to ask regarding the x pipe ,if i change my resonator. what is the size of the xpipe? is it an open single tube inside? or its a dual tube with dividers? sory for the question i dont understand about x pipe , i just want to make sure for my set up.

 

For the X-pipe kit you will need:

- 2.5" dual inlet/outlet X-pipe
- Dual 45 degree mandrel bend pipes 2.25" inner diameter (roughly 2.35" outer diameter).

I would do the 2nd cats at the same time in order to save on labor at the exhaust shop. The high flow 300-cell metal core cats are $180 shipped for the pair. Parts should run you no more than 275-300 shipped at most. Doing both at the same time will significantly improve the performance of your vehicle and will properly prepare your exhaust system for the headers, which will be the last step.

Hope that helps,
~AMS~

 

This isn't necessarily a good x pipe design, but it makes it easy to see what it does. The x pipe allows gas from pipe A upstream to go into pipe A or pipe B downstream. It is sort of like a junction that briefly turns the separate exhaust paths into one exhaust path.

 

correct, it helps balance the pulses and also smoothens out the exhaust note by cancelling unwanted exhaust notes. Its a great way to pick up 8HP on the top end.