Hey guys, I'm about to do the exaust on my truck, and I need a little advice from somebody that has some experience in it.

I'll be running some Edelbrock shortie headers into true dual 2.25 pipes, no cats, and Magnaflow mufflers. I'm going to do some sort of crossover pipe aswell, but this is where I'm getting confused.

Where is the best place to put it? Before the mufflers or after?
Should I use the same diamiter pipe, or smaller? (or even bigger?)
Is it going to be worth paying the shop more for the X pipe, or will an H style be sufficient?

Motor is just a 4.3L, I'm going for maximum torque scavenging. Thanks in advance.