crotchthis

does anyone know if 3.8 headers will fit on a 05 4.0?

Torch Red GT

no you need to buy headers that are made for the 4.0, Are you looking for shorties or long tubes?

JCON

unless you are hardcore buy American, you can get copies pretty cheap on ebay

basketballord

The cheap copies on eBay are generally not American... Chinese if i remember right. But i agree, you might as well save some money and go with the knockoffs if you aren't real hardcore. I've actually heard nothing but good things about them, but I am sure you could find a horror story if you dug for it.

crotchthis

ok well that leads to my next quetion im trying to actually find some turbo manifolds for my car its not working very well you guys dont know where to get those do you but thanks for the 3.8 info

JCON

Yeah they're chinese and nearly identical

bmasek89

Would it be better for him to go long tube or shortys on that 4.0? Ive been trying to do the same, just curious which would be better?

JCON

Long tubes have better sound and performance. cost more and require a lot more work. plus relocation of cats and O2 sensors. Shorties are a cheap and easy bolt on for a few ponies (I think someone somewhere said 9?)

basketballord

Most people i know who have gone long tube get rid of their cats, which = crap sound on the 4.0. You can get a little more power out of the long tubes if you are f/i, but otherwise it's really not worth it imo. Shorties for sure, save yourself the money, time, and frustration.

4.0 $tang

get the ebay headers for $100...they will give you a bit deeper sound on your lower end from like idle to 3500 rpm....as for HP gains i would honestly say 3-5, not 9