Bill/Cory Exhaust Thoughts

[Jackpine]

Good post, Lars!

I think you're right about the OBDII systems. I'm sure the PCMs are calibrated to "expect" the backpressure of a muffler and to work with it. When that backpressure is missing, I bet they try to compensate by reducing the outflow (which probably cuts the inflow of gas and air - so, less power).

- Jack

[Dixie Design]

I've talked quite a bit about my exhaust on these forums, there's a couple clips in my sig. I did a few things in steps rather than just going from stock to my current setup and would be happy to chat about it all again.

Here's the original post, and again check the clips in my sig they are the newest

http://dygytalworld.ehost-services13...p?t=209&page=1

[DarrenWS6]

For a cat-back swap only, I also would suggest the Roush Off-Road. I still wish I had gone with it. The best performing exhaust is a 3" single for these trucks, with a 3" single tailpipe or dual 2.5" tailpipes.

One of the absolute best set=ups would the the Dynatech LT setup with Magnaflow hi-flow cats and Y pipe ( avail. as kit for $1400 from Troyer ) to a 3" single exhaust with a straight through muffler.

I noticed a little loss when I had my 2.5" true duals done. I had to have the sound though. True duals is not a good performance exhaust unless theres a cam and supercharger to back them up, otherwise stick with 2.25" for better scavenging. I couldn't bark the tires from a WOT punch after I got my exhaust, was able to again when I removed my rear converters, and i'm able to leave a couple black dashes with the Gryphon lol.

In general terms, my suggestion would be run 3" from the Y to a straight through muffler of some type ( Magnaflow, Roush kits, Bassani, Borla.. )