I'd look at getting a new pipping kit mate just looked at your build thread and does look on the small side.
Drop me a pm once you've sorted the pipe and will sort u out buddy.
Pipe size is fine if its 50mm / 2". I know Hondas running 300 plus on 50mm pipe work
Is there any restrictions or really sharp bends in the intercooler pipe work?
What air filter you using? When was it last cleaned?
Hello bud yes pal on the hot it has 2" then goes to 1 and a half " its the only pipe i had laying about
thanks for your help rory
Get that 1.5" out and replaced, will soon see your issues disapear after a map tweak.