Just increasing the boost only increases air flow which will reduce smoke and give a cleaner burn but not much more.
You need a free flowing exhaust and more fuel to go with the increased air flow for more power.
a free flowing exhaust should result in slightly higher air flow throughout the load range (turbo spinning up quicker)
However there come the point of diminishing returns when more air means higher air temp and no more gain, so a better air intercooler cooler adresses that
and possibly more power sooner, you can spend lots for little gain.
If you plan to do a lot of high load running (towing of heavy loads) then the cost can be apreciated as economy improves (less smoke more complete burn fuel drive vehicle not just up in smoke)
Joe
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