Exhaust or water/meth help lessen the smoke?

[serpa4]

Do either items help reduce smoke I.e. like propane does.

 

[super diesel]

No way to reduce smoke unless you change for a bigger turbo add N2O (not practical in most cases) when running a big program. Any time you add additional fuel to an already over fueled situation, it gets you even more smoke (ala W/M injection, propane, dual fuelers with a big program) so on and so forth. The exhaust will help it breath alittle bit better as will a good intake system. This may reduce it slightly only though. EGTs should fall a little (I said a little only) as well. A slightly smaller tune may net nearly the same results but with less smoke because of the already over fueled situation.