Cost to power gain ratio.... 6.5L vs 4BT vs 6BT

[PhoenixZorn]

What kind of trans was the truck running? that sounds good!! the trick is in the little details, cylinder head precups, high flow injectors, four plunger injection pump "db-2831" not db2829, timing gears, free flowing exhaust, most importantly keeping the EGT down below 1150*, as long as these are similar the 6.2 /6.5 will produce similar results.

The 6.2 is capable of matching a stock 6.5 for power with just the banks exhaust and turbo kit. You need other mods along the lines of what I mentioned above to get the 6.2 to produce 300hp and 500lb-ft at the crank. Like the 6.5, the 6.2 has 21.3:1 compression, the same heads, the same pistons (brand, not size...) same crank, same bearings, etc... Unless the banks kit is pushing the 6.2 to 20-25PSI, there is no way it can put down those kinds of numbers with just the turbo and exhaust. At those boost levels, you are just as likely to blow a head gasket on a 6.2 as you are a 6.5.

Taken from the Banks Power website.. Sidewinder® Turbo System - Ultimate upgrade for 6.2L workhorses. Out-performs GM's 6.5L factory turbo or any other turbo. Best gains: +60 hp and +115 lb-ft (rear wheel) plus 10% more MPG. Starting with about 150hp and 320lb-ft of torque, that would give about 210hp and 435lb-ft with the upgrade... at the crank, so about 170-180hp and 380-400lb-ft at the wheels... if you are lucky.