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It sounds like you're too stuck on using prefab'd parts...
If I were you, I would get over trying to buy stuff over the counter.
Yeah, it's nice to brag you're using this and using that, but you're just making things harder on yourself on this build.
1) That HKS downpipe is not going to bolt onto the GT35R.
2) I dunno what a "E8K" is?
3) Stock injectors will not support 300hp.
4) Stock ECU is just about it's limit at the 300hp - 325hp level you're looking at, but couple the stock ECU with an S-AFC device can work (with larger fuel injectors).
5) Don't bother with the APEX'i exhaust - it's necked down to 65mm in the front to mount with the stock exhaust; you're choking your exhaust system.
If you insist on the A'PEXi N1 muffler look, just buy the muffler - get a custom 3" exhaust build from your local muffler shop.
At the same time, have the muffler shop make you a custom downpipe insteading of modifying that HKS downpipe, cause you're going to need it to fit with the GT35R.
Do you actually have these components?
A lot of stuff is big bucks - i.e. HKS, Koyo - so if you already have it, I can understand.
Those eBay IC cores are cheaper (sometimes under $100) and do just as well, if not better than, that HKS Type-S IC.
If you do go with the Haltech, who is going to tune it?
Are you going to haul the car to some tuner to have them tune it for you?
-Ted
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