my car is a series4 1988
has a t4 comp wheel in std turbo
3" mandrel bent exhaust from turbo no cat
1 cool sounding muffler
simota intake filler
some big bov
gizzmo chipped cpu
turbosmart boost controller
lowered with mags
boost gauge
lsd
front mounted i/c (factory ic)
most emission crap stripped off
alarm


question what next?
is 12 psi to much to be running? it goes ok but i want to go faster.

i want to build a 13t bridge port is i reliable? can i do it to a six port s4 engine? and run the std inj? and comp? reliably?

how much difference does a dump pipe (screamer pipe) make?

im only new to rotas so any help will be apreciated.