60-70KW was an answer to your questions 'what power will I make?'. Gains themselves probably 5kw from intake and exhaust.
I'd recommend not changing your intake manifold and that would be a waste of time but if you insist then I would strongly suggest the D16Y8 manifold. It makes more mid-high end power.
If you want it to sound like you're going faster then do your intake and all your exhaust. Might be a handful of kw.
If you want to actually go faster then get a lightweight flywheel and a higher FD. Or go turbo of course.
unless u are doing a full rebuild with a truck turbo on it i wouldn't bother !
do b or k would be way better more costy but a d series is always going to be a d series
Keep the D, spend all the money on a compressor / die grinder / dremel and misc pieces. Buy a head thats the same one as youve got now, attack it with aforementioned tools to try make it flowier. Stick it on a dyno to see if it worked. Repeat the process a few times (maybe buy a bunch of heads in bulk?) and teach yourself how to clean up a head. When time comes that youve got more money for a more powerful build, youve got the skills to do some of the work yourself.
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