Ted'98
 

Read through your post on matching your NPI heads to a PI manifold and also the coolant mod. Searched all over but couldn't find any posts with how satisfied you were with the results. Did you get the gains and driveability you were hoping for? I recently bought a 99F250 SD CC and would like to make it a little a little healthier. I didn't do enough research before I bought and was disappointed that it has the NPI heads. I pull a 5000 pound snowmobile trailer as often as I can in the winter months, and would like to get some more hp and torque. Trying to decide which route I want to go, rebuild and mod the existing motor or just replace it with something from Jasper or one of the other shops.

Thanks,
Pat