Question time!!

[boosted]

1.Safe Boost increase on std t2 turbo? (fueling std etc). Will be fitting colder plugs.
2.Not keen on bleed valve when i did my s14 i fitted an adjustable actuator, i still have original from s14 and can make this adjustable, is this the way to go?
3. Bought a large calibra turbo intercooler on ebay for a quid so no worries with this! engine driven fan removed. Have electric fan and cowling to fit to rad.
4. Is the wheel stud pattern 4 X 114?
5. Availbilty of lowering springs and or dampers.
6.Running side exit with just middle box. Still well below track db limits. Any other options?
7 Any other concerns/ info?
8. Where can i get rear spoiler as mine missing from my car?
(have read all of how to section).
Many thanks for help
BOOSTED