Ok. I'm 99% sure its my clutch.

Putting the pedal down in 3rd, and 4th the car goes normally till about 4500rpm then it slows down to 4000rpm 'grips' and goes hard again. There is kinda 'lag' during boost.

is that my clutch slipping? It also is kinda rough at low revs putting it in from neutral to first.

If its a new clutch, what is recommended? My car is stockish with bov, 3"ex, k&n filter etc

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Classic WRX = Best