Heres a nice read..... has some good info in it

http://www.modularfords.com/forums/s...ight=Longtubes


Why cant I post this above without it not allowing me to put modularfords in the link... thats kinda shady... kinda limitting the transfer of knowledge from one forum to another

 

Dont know about headers as im still on stock manifolds but I will tell you this, there is a pretty big gain swapping from stock cats to an O/R H or X pipe! About 8 months ago I bought the Pypes O/R H and swapped it in. I felt an pretty stout gain seat of the pants. It was on the car for a week before the Blower was installed. Fast Forward 8 months and I moved from Chicago to California. I had to go get it smogged so I swapped the stock cat pipe back in. Holey Flock what a slug! Couldnt believe how slow it was, and the weight of the stock set-up is pretty substantial. Of course once I removed the Pypes I had to start it up open headers before I put the stockers back in. The throttle response was insane! I only ran it for a few seconds but it really shows you how important a freeflowing exhaust is. If I were you I would go with the longtubes, a catless mid pipe, and any muffler as they show no performance improvements. Make sure you buy a bottle of aspirin because you will get headaches from smiling so much ...