I doubt its the starter.My 440 with 2 inch TTIs and a at least 15 year old reman from Advance cranks like a /6 My kids 413 with big headrs and a 440 Source did as well.My starter is right next to the headers.Look at battery,cables I run 1 gauge.We used mostkly Advance remans at work AZ not as much but really didnt have many problems.Ill bet you cables are the wimpy OE style or old.Seems people wont upgrade them.I can run my 12.5 440 all day and it still starts fine.Remember on batterys and cables bigger is better.Ohy starter is for a 99 360 Ram.There are at least 2 and one is not as heavy as the other.The 360 is the big one for sure.Rocky