exhaust and cam questions for a 91 isuzu

[stykthyn]

Hey guys, this sight rocks! I didnt think there was this much knowledge about our engines out there! I have a 91 isuzu with a 3.1 that I am planning on upgrading to a 3.4 this summer. I want to start the exhaust now since my manifolds are cracked and the rest of the system is rusting off. Should I run duals or stick with a stock setup? I really want good low end torque and mid-range power, that's my goal anyway. I heard the flowmaster 50 series works really well, any suggestions? I also am curious what is the best aftermarket cam and rockers?

[Doubt_Incarnate]

id have to thinks a good dual setup with an h-pipe would do a lot of good. as fa as cams, its a matter of aplication is what determines the best one. for the trooper (you did say isuzu, right? what other isuzu gets the motor?)you wouldnt want a real agressive topend cam, if you pull anything, you'll be like "where's the beef?" if your just runnin&gunnin, i guess it couldnt hurt. the popular cam is the gm performance cam or the crane h260-2, identical cams. then thers the crane 272, which bumps the power further up, but it comes later, with less low-end. youd probably be happier with forced induction, it doesnt move the power around so much as just multiplies it.

[geoffinbc]

Big dual exhaust will take away alot of low end torque. Keep it single through the cat and then split it after if you want to. Go 2.5" pipes. I would rather have a Borla muffler over a Flowmaster. I am sick of the Mustang sound.

[firechiken]

Could be a trooper, a rodeo, or a pup. Single 2.5 is what I would stick with. Headers would have to be custom made by a shop. I've been meaning to get to the junk yard and find a set of headers from an s10 to see if they fit (I think they were made at one time). Check out s-series.org for info on cams and doing the 3.4 swap, and 4x4wire.com has an isuzu forum you could check out for isuzu specific info.