160 and 175 pumps came with 131's
180 and 215 pumps came with 181's
no truck pump ever came with factory 191's

and 191's are pretty nice valves.

 

I'm pretty sure my truck has the 215 pump. 97 5spd. Right?

 

should have the 215

 

I'm going to sell the turbo and get twins.
1. Where should I list the turbo for sale at?
2. What is the best compound setup for towing, mpg, and between 450hp - 600hp.
I don't want to go over 600hp because my clutch is rated for 650hp.

 

here or any other diesel site ... and if it were me an he351 over an s471 is what I would do