Jayhovah

Seems like a lot of reports of the old GTM manifolds cracking.
You could probably move to the new GTM/Gamma manifolds / o2 housings. They flow significantly better (according to GTM) and are easier to install (compared to what I saw in the install manual for the older style kits).

One thing to note though... the flange positions from the o2 housings seem a little off to me. I can't confirm this because I also installed cheap ebay test pipes at the same time and my exhaust didn't fit quite right. I don't know for sure if it is the gamma o2 housings or the test pipes (or both) that are causing the issue for me... but I do know that GrooveStyle has Z1 test pipes (and the same Gamma V3 kit) and his exhaust also didn't fit quite right.

edit: I have some old GTM test pipes waiting to go in to see if the fit improves. If not, I will just have a custom exhaust shop cut/modify them to fit properly. Should be a relatively inexpensive job.

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2013 Gun Metallic Sport - Gamma V3 Twin Turbogized
DIY Gamma V3 TT Install * Jayhovah's Gamma V3 TT Install Pic'Z and Vid'Z * DIY: Washer Reservoir for the Boosted