Yes having an intercooler is better than not ,,, but depending on your turbo, driving conditions, and future plans.. For the time being i would say no.
I look at your situation this way spend around 300 on parts(cheap intercooler, pipes, and couplers) then routing piping.. Big Pain In the a-- and a decent amount of time
Or focus on things that really are going to make a difference.. I would start up a megasquirt setup especially if you are focusing on 300bhp... At your stage management is way more important than cooler air...
Fuel delivary is the big concern 280's with a fuel pump and managment and why not run 10 psi
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mx-3 Kl Turbo (Weekend/show car)
95 talon tsi awd (Daily Driver For Sale 6,000 or Trade for a Mx
1989 Cbr600 (StreetFighter/Stunt Bike)
1967 Winnebago Motor Home (Pimped out Party Bus a friend and I went in halfs on)
1972 gremlin X Turbo Diesel
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, 1999 VR4 Fathers Cars that i end up working on and drving alot