I'm having a big problem with my manifolds leaking on my 92 and i wanted to go with the Thorley headers howeve ri have a auto. What kind of mods to the y pipe would i ahve to make if those headers will even work with that setup. thanks
I had mine installed, but I don't believe any modifications were needed. My headers have been on for about a year and have worked pretty well. The biggest difference was the 2mpg increase, especially with gas prices being what they are. My truck is a 94, with the V6 and auto tranny.
I also found the other day on the Summitt racing site (I Think) that there is now a new locking stud / bolt for the exhaust manifolds / headers, but I can't remember where exactly. If I find it again, I post it!
Those headers (Stillen) are VERY expensive and are tuned for fairly high RPM power gains (4500 and up if memory serves). I'm sure they would bolt up to the truck V6 but the cost is prohibitive (nearly twice the cost of the Thoreleys).
List is somewhere around $600 (a little less I think). The cost/performance ratio is too high even for us Z guys - and all of our parts are expensive. I don't know anyone who recommends them unless you need to have EVERY performance upgrade or are using NOS, and even then they recommend that you do them last.