rollinsmoke99 Posted March 18, 2014 Share Posted March 18, 2014 2004 mack granite dumptruck has the 370 Horse AIM engine i believe they call it. My question is what exhaust manifold do people put on these to make them run better? I heard people say any of the pre emmison engines , something like the E TECH? This thing is such a dog taking off loaded and empty and heard a different manifold would make a huge difference Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/ Share on other sites More sharing options...
Mackpro Posted March 18, 2014 Share Posted March 18, 2014 The ASET AI exhaust manifold that came on your truck is very small compaired to the regular ETECH style manifold. I have heard that if you do replace the manifold with an ETECH style maifold you must also replace the turbo, as the larger air flow will over spin the AI turbo and cause it to fail. That was from our turbo rebuilder. As far as poor throttle responce and being sluggish, have you had the "Step 12B" download done to it yet??? Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/#findComment-237964 Share on other sites More sharing options...
rollinsmoke99 Posted March 18, 2014 Author Share Posted March 18, 2014 Thanks for the quick reply , I had a download about 2 m 1 Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/#findComment-237968 Share on other sites More sharing options...
rollinsmoke99 Posted March 18, 2014 Author Share Posted March 18, 2014 Thanks for the quick reply , I had a download about 2 months ago , not sure what one it was I'm assuming the latest . But your right it has no throttle response when taking off So what year manifold off an e tech should I get ? Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/#findComment-237970 Share on other sites More sharing options...
Mackpro Posted March 18, 2014 Share Posted March 18, 2014 Whats the last 6 of your vin? I can see if the newest software was downloaded. On the manifold, any 1999-2002 CH or CX should work, the ones for the MR and LE and CL are different though. I have heard of people doing this but dont know 100% if it really helps alot. Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/#findComment-238012 Share on other sites More sharing options...
rollinsmoke99 Posted March 18, 2014 Author Share Posted March 18, 2014 M014044 Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/#findComment-238030 Share on other sites More sharing options...
Mackpro Posted March 18, 2014 Share Posted March 18, 2014 Yes , your software/datafiles all are up to date. What size tires you got on the truck ? The truck came with 22.5 wheels, If someone changed wheels and put 24.5 full size tires on it with the 4.42 rear gears it might seem sluggish. Also there are 2 open recalls on this truck. One for a faulty brake valve and one for steer axle beam inspection. Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/#findComment-238034 Share on other sites More sharing options...
rollinsmoke99 Posted March 18, 2014 Author Share Posted March 18, 2014 22s on back. 385 floats Has Mack 10 speed with the reverse on the button. It's just so doggy It seems like the throttle response doesn't change from 1/4 to full while you shift a gear. My other 2000 Mack rd and its electronic had way better response Just looking for more giddy up and go and I heard so people doing exhaust manifold makes a big difference then later some injectors then turbo Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/#findComment-238037 Share on other sites More sharing options...
Mackpro Posted March 18, 2014 Share Posted March 18, 2014 I updated my post above yours, Look at getting thoses recalls done Quote Link to comment https://www.bigmacktrucks.com/topic/35079-2004-granite-exhaust-manifold/#findComment-238039 Share on other sites More sharing options...
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