Cummins 2005 ISL low power AGAIN!
What we thought was a sticking exhaust brake on our MH is now a, They don't know. The exhaust brake checked out good and functioning properly. $515.67 later and Cummins West thinks it could be a faul...
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I have a 03 ISL and 23-24 is all it 's ever done. Plenty of power and I'm on the heavy side.
