LPTinc Posted April 26, 2022 Share Posted April 26, 2022 I have an 2004 Mack Granite CV713 with a 370hp Ami engine. When I shift to the next gear I end up at about 1200 - 1300 rpms (to low) puts me out of the power curve. Couple friends have same truck and does same thing. I read on here about changing exhaust manifold to older style (much bigger ports) and change over from my 3” turbo to a 4000 series 4” turbo. Truck come alive with power. It’s been a while since reading the article and want to know if I’m correct in what I said was in the article? Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/69611-turbo-3%E2%80%9D-to-4%E2%80%9D/ Share on other sites More sharing options...
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