I've got a Bisimoto (WebCamz) level 1.2 Turbo Camshaft in mine.
Thousands of happy customers, dyno proven results, and they're at a good price to!
Personally don't see why you'd buy your Camshaft(s) anywhere else.
It's not 4x4 status, think of it as "Winter Mode".
gsr cams with gt2871r .63ar with 20psi to make 300whp with a large powerband and run 124mph at the drags.
itr cams with gt30r.
my gsr cams cost me 50$ on ebay and worked very well on the gt2871r
my itr cams also worked very well on my setup with the 30r, although i didnt get to see there true potential before my engine broke, but that made 395whp on 22psi on my b16.
for springs, i had skunk2 tuner springs with gsr cams and they were too soft and my valve train was noisy,
i upgraded to supertech springs and retainers, i believe they had 85lb of seat pressure and they worked very well with the itr cams and boost i was running, nice and quiet valve train.
Std B18C are the best on a budget. The less overlap the better it works best on a turbo.
Can go ITR with adjustable gears to reduce overlap and blow by.
Either option will give you 300hp easy.
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