Turbo side:that 1k rpm difference shouldnt take that long right?
this might help:
turbo side:
port and polish the stock turbo
ball bearing journal
twin scroll turbo
downpipe (noticable different on response after i change to bigger downpipe)
port and polish the stock turbo - this is to smoothen out airflow ?
ball bearing journal
twin scroll turbo
downpipe - > DONE, when converting into my E46, this one is larger like 3"
In between twin scroll vs ball bearing, which one can be much easier to be modified into CT15 stock turbo ?