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Originally Posted by pdxhummerguy
I appreciate the input guys. I am not expectig the same performance gains as on my 7.3 psd. That thing is a beast. I would just like to see some improved performance be it ever so slight. i think even another 50hp would help a great deal. Does that exhaust from rubber duck give that nice clear crisp turbo whistle? The ex has that and I love the sound.
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The duck Exhaust sounds great. If you want the Turbo whine then cut off the Cat. I have the stock Exhaust but I cut off my Cat and muffler. It isn't too loud but Miata?s hate me at stop lights
. You can add all kinds of stuff for power. Here is what I am doing to my wagon while the motor is apart. This is tamed for longevity because I wheel a lot. I put on thicker head gaskets to lower the compression, a Predator mechanical waste gate (will be running around 10 lbs of boost), Predator lift pump, #9 resister for PMD (this won?t do a thing without having the injector pump re-timed), Ceramic coated exhaust manifolds, Ceramic coating Turbo pipe, 180 thermostats, and a few other odds and ends. You can also get a new computer from Heath or Predator. Predator claims 155 hp with their Stage 3 kit. I would guess it would be closer to 100 hp.. But all in all I trust Predator with H1s.