im looking to buy a another truck soon. I had a single cab short bed 03 ram 1500 auto tranny with a 5.7l jasper engine. i liked the power it had i just feel like i needed more truck. so now im looking to get a 4 door short bed truck. id like a 2006 to a 2013. I like that style so thats why im choosing those years. im very new to the diesel world to say the least. I know a bit but not enough to really know what i want. im the type to tune and mod every vehicle i own. so i guess ill get down to it, whats best. 5.9l or the 6.7l??? i like manual trans best but then im not sure if i should get the truck with an auto. which years can i run straight pipe exhausts with out screwing up the truck? im lost. input would be great guys!