Mine has been tuned by the Diesel doctor in effingham it seems to have that unstopable power goes up the mountains with heavy loads without having to downshift and great acceleration or throttle response also gave me alot better fuel mileage its a 10 wheeler also. I get better than 12 1/2 at 60mph about 12 at 65 and starts dropping considerably after that these milages were checked on straight flat roads not mountains. Just wondering what that kit they sell to convert the twin turbo's overto single would do and if anyone has ever done it.