Well I went up to this shop (mostly honda customer) trying to canvas some cheap Apex N1 exhaust and they told me they only come all the way up to the cat back.

My question is for a turbo back, I have to buy a Straight pipe separately and attach it to my cat back exhaust? or do they actually have an exhaust that goes all the way to the turbo already like the Apex

what ru talking about dude? They don't make turbo back exhuast, they make cat back exhuasts. If you want a turbo back exhuast you need to make it yourself. One things for sure our cars aren't factory turbo so we have no turbo exhuasts, we have to use GST exhuast. my exhuast is custom downpipe back exhuast, so if you want from the downpipe back you can do it custom.

Homie I was talkin about my GST not my GS well sorry if i confused u

i don't look up the 4g63 much. if you want quality stuff goto roadraceengineering.com they have dp's for ya