HS 1.7's made no difference
 

I recently installed the HS 1.7 roller rockers in my 99 D 5.2 and first drive out I didn't notice any difference in performance, mileage, or exhaust noise(I have a straight pipe system with a very small hi-flow cat). After a day, I realized I didn't reset the pcm, so I reset the pcm and still no difference. Ive put on about 300 miles since the install and no difference in mileage, power, or exhaust and 1/4 mile times unchanged. I read so many good things about them and now im disappointed that I just spent $350 with no gain. The only thing they did was smooth everything out especially in the high rpms. It's not like these are my only mod, like I said I have hi-flow exhaust, ss headers, k&n cai, helix tb spacer, msd blaster coil, 8mm wires, superchips flashpaq, brand new quality plugs, wires, cap, and rotor, freshly cleaned tb and sensors, and I only run mobil 1. Anybody have any input, maybe I did something wrong?

Nobody has anything to say, suggestions maybe?

Can somebody please shed some light?

I'd go ask your question in the 2nd gen ram section (same engines) if I were you. There are way more of them so there's a better chance of coming across someone whose done this than there is here.

Starting to wonder if I've hit the limit of my superchips tune, I'm on the 91 octane performance right now, or is something else possibly restricting airflow?

Thanks that guy, will do.